Saturday, 22 August 2026

Blake's 7 Season 3


In the absence of any news on the next Doctor Who - The Collection box-set, we can at least look forward to Season 3 of Blake's 7 coming this Autumn. This is the first one following the departure of the title character, so Paul Darrow's Avon really comes to the fore.
As with the previous seasons, there's plenty of Doctor Who crossover in terms of guest stars and even the odd prop and costume.
Each episode comes with brand new VFX. There were a few very good model shots in the broadcast episodes, but generally I was always disappointed in the standard of effects in the series (like the Federation Pursuit Ships and even the Liberator itself looking like cardboard cut-outs).
There are usually a lot of excellent extras.
No confirmed release date yet - Season 2 came out in November last year. It has been on pre-order on the usual sites since March, RRP in the UK £39.99.

As for the next Doctor Who box-set, well that was expected late October, going by previous years - but the Autumn release was usually advertised before now. 
All but one of the outstanding seasons has major technical issues to resolve or missing episodes which have yet to be animated (and the stand-alone animations have pretty much dried up it seems). 
It may well be the case that we are only going to get one release a year going forward. The one season which is relatively "good to go" is the one most people do think will be next - Season 16, the Key to Time. 
Whichever one comes next, I just hope that they lay off the AI picture "enhancements", which have been universally criticised...

Thursday, 20 August 2026

R is for... Rattigan


Luke Rattigan was a teenage scientific genius, best known for inventing ATMOS, a system which effectively removed carbon dioxide from vehicle emissions. 
He had begun by inventing new computer software aged only 10, and by 12 he had created the successful Fountain Six search engine.
He used his wealth to set up a private academy in North London, which accepted only the most gifted of students. Much of the work they did was around space exploration, including terraforming technology.
He had secretly entered into a partnership with the Sontarans, who sought to exploit Earth's pollution to turn it into a clone-breeding planet as part of their long-running war against the Rutans. ATMOS was really designed to pump out the gases necessary to change the atmosphere of the planet. 
It also had a built-in satellite navigation system, which could be overridden to eliminate anyone who tried to investigate what Rattigan was doing, such as journalist Jo Nakashima.
General Staal of the Tenth Sontaran Battle Fleet had a flagship in hidden orbit above London, and had set up a teleport unit at Rattigan's academy, as well as another at the ATMOS factory. 
The latter was investigated by UNIT after a number of simultaneous deaths globally, all involving the device.
Rattigan had been promised a new life with his students on the planet Castor 36. 
When ATMOS was activated across the planet, he found that his students were unwilling to abandon their families and follow him. When he reported this to Staal, he was shocked to learn that the Sontarans had never intended to honour their promise.
The Doctor elected to use a terraforming device to destroy the Sontaran flagship, even though it would mean his own death. Seeking revenge, his dreams of a new society shattered, Rattigan swapped places with him at the last moment and activated the device.

Played by Ryan Sampson. Appearances: The Sontaran Stratagem / The Poison Sky (2008)
  • Sampson began his acting career at the Crucible Theatre in Sheffield, but is best known for long running TV comedy roles, including Brassic and Plebs.
  • He was a fictionalised Charles Dickens in The Frankenstein Chronicles, and played Dudley Moore in an episode of The Crown.
  • More recently he has been seen as Mr Collins in The Other Bennet Sister.

R is for... Ratcliffe


An East End businessman who led an organisation known as The Association. Ratcliffe had been a supporter of Oswald Mosley's British Union of Fascists before the Second World War, leading to his imprisonment. The Association carried on many of its racist ideals. 
In 1963 he was running a builders merchant business in the Coal Hill area of Shoreditch.
One young member of the Association was Sergeant Mike Smith, who was attached to the Intrusions Counter-Measures Group, a specialist military force.
Together they worked with the Supreme, leader of a renegade Dalek faction, to obtain a stellar manipulator device which had been left in the area by the Doctor. This was the Hand of Omega, which had first helped give the Time Lords the power they needed to begin time travel experiments.
Ratcliffe allowed the Supreme to install its battle-computer in his office. This was operated by a schoolgirl under the Supreme's mental control.
His reward for helping the Daleks was the kind of fascist society he longed for, one in which he would have a leading role to play.
However, a second Dalek faction - loyal to the Emperor - also came in search of the Hand.
Through Mike, Ratcliffe was able to steal the remains of a destroyed Dalek to prevent the ICMG from investigating it. He then located the Hand, buried in a local cemetery, and had it dug up and moved to his yard.
Imperial Daleks attacked and seized it. When it became clear that the Daleks could not be trusted, Ratcliffe and Mike tried to steal the Supreme's time travel device to use as a bargaining chip. The schoolgirl had also been given special powers by the Daleks, including the ability to fire lethal energy bolts from her fingers. As Ratcliffe tried to flee, she killed him.

Played by George Sewell. Appearances: Remembrance of the Daleks (1988).
  • Sewell (1924 - 2007) was best known for playing policemen or villains. 
  • He came to acting only in his mid 30's through Joan Littlewood's company at Stratford East, after meeting actor Dudley Sutton in a pub. He appeared in the stage productions of Sparrers Can't Sing (and its film adaptation Sparrows Can't Sing) and Oh, What A Lovely War!.
  • For Gerry Anderson, he played Colonel Alec Freeman in 17 episodes of UFO

R is for... Raston Warrior Robot


One of the most lethal killing machines in the universe, according to the Third Doctor. He and Sarah Jane Smith encountered one in the Death Zone on Gallifrey. It inhabited a cave on the far side of the mountain which loomed over the Dark Tower, tomb of Rassilon. This cave contained spare weapons, though it had many built-in. These included spears, a sword and razor sharp throwing discs. It moved with lightning speed, causing it to appear to vanish as it moved.
In appearance, it had a sleek silver body with a featureless mask. It may have been left over from the ancient war games instituted by Rassilon, or a recent arrival brought into the Zone by President Borusa using the Time Scoop.
The Doctor and Sarah witnessed a party of Cybermen wander into its territory. It quickly destroyed them all. The distraction allowed them to escape, the Doctor taking some steel rope from its cave with which to reach the top of the Tower.

Played by Keith Hodiak. Appearances: The Five Doctors (1983).
  • Hodiak Hampden Sears (1950 - 2025) was a Guyana-born actor and dancer.
  • He featured in the movies An American Werewolf in London, The Lion, The Witch and the Wardrobe, Full Metal Jacket and Revenge of the Pink Panther, whilst TV roles included The Chronicles of Narnia and Are You Being Served?.
  • The robot's origins are obscure, and the name doesn't help. Is it a robot created by Raston Warriors, or a Warrior Robot created by the Rastons? Or indeed a quite distinct autonomous robotic race?
  • The non-fiction BBC book The Monster Vault claims that the name Raston derives from "Rassilon Automaton", suggesting they were created specifically for the Death Zone.
  • Ironically, the costume was a reused version of the Cyberman sentinel androids seen in Earthshock.
  • The Robot was a late addition to the script, replacing a sequence set in a village populated by Autons.

R is for... Rassmussen


A scientist encountered by the Doctor and Clara Oswald on the Le Verrier space station, which was in orbit around Neptune. In the 38th Century, the human race had sought to maximise productivity by reducing the need for sleep. This was still essential for physical and mental health, but technology had been developed to compress it into a matter of minutes rather than hours. 
Professor Gagan Rassmussen was the inventor of the Morpheus Pod, which rewired the human brain via a carrier wave, allowing its user to achieve a month's worth of rest in only five minutes.
An unfortunate side effect of his improvements to the system was a build-up of rheum in the eye, which gained sentience through the carrier wave. The pod users were then consumed by the resulting organisms, known as Sandmen. Rassmussen himself was a victim, but the Sandman which devoured him was able to take on his likeness.
He then manipulated the rescue party which was sent from Neptune to find out why contact had been lost with the station, creating a seemingly plausible scenario for why he had survived. His plan was to beam the Morpheus carrier wave out across the Solar System to infect everyone and so create more of his kind.
This would be achieved through people viewing the footage from the station, with the carrier wave hidden within the transmission. This was why his contrived narrative had to be exciting and interesting to watch.
The Sandman Rassmussen could not hold his form once the station's gravity shields were destroyed, and he crumbled to dust.

Played by Reece Shearsmith. Appearances: Sleep No More (2015)
  • Mark Gatiss wrote the part of Rassmussen especially for his fellow League of Gentlemen star Shearsmith. Gatiss had already featured in the series, twice, as well as writing for it, whilst the third of the Gentlemen - Steve Pemberton - had guest starred in Silence in the Library / Forest of the Dead.
  • In 2013, Shearsmith portrayed Patrick Troughton in An Adventure in Space and Time, which was written by Gatiss.
  • One other Doctor Who connection - again through Gatiss - are appearances in the P.R.O.B.E. spin-off videos, which featured Caroline John as Liz Shaw, and Auton, all produced by Bill Baggs.

Tuesday, 18 August 2026

Inspirations: The Pyramid at the End of the World

 
We explained the general inspiration for this trilogy of episodes last time. Writer Peter Harness's idea had involved "Kung-fu Monks" whilst Steven Moffat had actually considered destroying the Earth - but as separate stories. The showrunner then decided to merge these, plus Toby Whithouse's 1984 Orwellian society drama, into a single storyline.
Harness wanted his episode to be a comment on current world affairs, similar to what he had done with his Zygon two-parter the series before, which had dealt with issues of radicalisation amongst young Muslims. The background was Donald Trump's first run for the Presidency of the United States. He felt that what Trump was offering to the American people was simply a short-term fix, one that might prove disastrous in the longer term.
The aliens would therefore appear benign initially, in order to take in their intended victims. This idea had been used before by Bob Baker & Dave Martin in The Claws of Axos - an idealised family group of golden skinned humanoid, bearing gifts, who were actually tentacled monsters, out to destroy all life on Earth. It was also the M.O. of the Nimon in The Horns of Nimon. 
He hit upon the aliens as monks - generally peace-loving, spiritual individuals.
The "Kung-fu" aspect came from the fact that they were initially supposed to have martial arts skills.
They would turn out to be blackmailers from another dimension, who observed probabilities to seek out points in time when a race might be at its most vulnerable, then step in to appear to offer salvation.

Researching potential flash points in recent history, Harness noted an occasion when a Norwegian rocket was launched from the US for scientific purposes, but was mistaken for a missile by the Russians in 1995, and another incident in 1983 when the Russian satellite defence system had erroneously flagged up an attack.
It was going to be revealed that the Monks had tried to intervene before during these events, as well as the Cuban Missile Crisis of 1963, but this information had been supressed by the three major powers.
For his episode, he decided to go with a story he had read about an artificially created soil bacteria named Klebsiella planticola, which broke down plant waste and turned it into ethanol. However, this had only ever been tested in laboratory conditions using sterile soil, and in nature it would prove to be much more powerful - potentially destroying healthy plants.
We are naturally reminded of the insecticide DN6 in Planet of Giants, which appears effective to its creator in the laboratory but will actually destroy all insect life, including that which is essential for agriculture. Harness was actually going to call his soil bacteria DN8, and it was to have been manufactured by Global Chemicals - the company responsible for The Green Death.
This was changed as there is a real company of that name, though one which has never knowingly created a race of giant maggots (as far as we know...).
Hungover lab assistant Douglas was to have had a conversation with Erica about boiled eggs for lunch - a nod to the discussion between scientists Phillips and Goodge in Terror of the Autons.

Harness looked to his Zygon story for other elements. The Doctor would once again be made President of Earth, and the Monks would arrive in the disputed region of Turmezistan. This was where the Zygon rebels had established their base. Here, it is a potential point of conflict between the US, Russia and China.
Whilst the UN features, through the presence of its Secretary General, UNIT does not - despite this being right up their street. (UNIT had become disassociated from the United Nations back in The Sontaran Stratagem, but as an independent multi-national organisation you would have thought they ought to have been involved. They had actually been included in Harness's original storyline, including the return of Kate Stewart. She couldn't appear anyway as Jemma Redgrave had just taken on a regular role in Holby City).
The appearance of the Monks as mummies came from images Harness had seen of mummified corpses in catacombs, which he thought would make for a striking visual image.
Bill's role had to be pivotal. It would be she who would permit the Monks to intervene on Earth - more for saving the Doctor than for the whole world. His blindness - introduced in Oxygen by Jamie Matheison and carried over by Moffat, would lead to him having to be saved.
Bill was originally going to appear to have been vapourised by the Monks on her acceptance of their help, which would form part of the cliffhanger for resolution in the next episode.

Mention is made of the Doomsday Clock. This was created in 1947 by the Manhattan Project scientists to measure the imminent danger of human-made catastrophe. Midnight would signal the end of the world. As of January 2026 it has been set at 85 seconds to midnight - the highest it has ever been. This is due to the on-going risk of nuclear warfare, as well as the mounting concerns about the climate and the rise of Artificial Intelligence.
Next time: The Monks party like it's 1984. The Doctor looks like he's gone over to the dark side, until Bill shoots him...

Sunday, 16 August 2026

Episode 221: The Invasion (2)


Synopsis:
Vaughn studies the circuits which the Doctor gave him, then activates a control on his desk. A panel in the wall behind it slides open to reveal a strange machine...
The Doctor and Jamie are walking away from the IE building when they become aware of a car slowly following behind them. Another then blocks the end of the street.
They decide it would be useless to run and so sit down on the kerb, where the Doctor produces a pack of playing cards.
Back at her studio, Isobel is trying to find out more about her new friends. Zoe is worried that the Doctor and Jamie are still not back yet - knowing how easily they get into trouble.
Vaughn has summoned his head of scientific research - Gregory - to his office, to show him the TARDIS circuits. He gives him a deadline to work out their function and method of manufacture, then orders Packer to provide him photographs of the two recent visitors.
Zoe and Isobel decide to go and find the others at the IE building.
Benton and Tracy have driven the Doctor and Jamie to an RAF base, and they approach a large transporter aircraft which is sitting on the tarmac. Within is a mobile headquarters, and they are pleasantly surprised to find that in charge here is their old acquaintance Lethbridge-Stewart. He is a Brigadier now, and leads a force called the United Nations Intelligence Taskforce, or UNIT for short. He states that their encounter with the Yeti in the Underground was some four years ago.
UNIT was set up as an investigative, intelligence gathering organisation, and at the moment they are particularly interested in International Electromatics and its CEO Tobias Vaughn. This is why they were monitoring the building and noting everyone who visited. The Brigadier recognised them from photographs sent to him by Benton and Tracy.
He states that whilst they observe people entering, not everyone comes out again...
At that moment, Zoe and Isobel have arrived at the reception area of the IE building and encountered its automated receptionist.
With his photographs of the Doctor and Jamie, Vaughn is consulting with the machine behind the secret panel. It tells him that the pair are known to it from Planet 14 and are regarded as hostile.
Vaughn is intrigued to know how they could be known from an alien planet, and is concerned that the plan for an imminent invasion might be threatened. 
He is interrupted by the security feed from the reception area.
Frustrated by its failure to tell them anything about Professor Watkins or the Doctor and Jamie, Zoe gives the computer an unsolvable mathematical problem. It blows a fuse.
Vaughn watches, bemused, from his office - then sends Packer to fetch the two young women.
They are captured by uniformed security guards.
The Brigadier is showing the Doctor and Jamie images of the people entering the IE building whom he is concerned about. Some are top computer scientists and one is of Major General Rutlidge from the Ministry of Defence, who is UNIT's liaison with the government. Not all the people have vanished. Some have emerged but with changed personalities. Rutlidge, for instance, was in favour of his investigation into IE, but is now opposed to it.
The Doctor and Jamie then recognise another image as that of the lorry driver who gave them a lift at the IE compound. He is a UNIT agent, and has failed to report in.
The Brigadier informs them that IE have cornered the market in computer technology, thanks to the invention of a micro-monolithic circuit which features in all their products. He explains that Vaughn has powerful friends and his options for investigating him are limited, so the Doctor agrees that he and his companions will have to find their own methods of finding Watkins.
The Brigadier gives the Doctor a communications device before they leave, then arranges a lift back to London.
They find Zoe and Isobel absent when they get back to the house, and the Doctor begins to examine the radio which Vaughn had given to Jamie, intrigued by one particular circuit. They then read a message Zoe has left to say they have gone to the IE building to look for them. They hurriedly depart. 
Vaughn is explaining to his latest visitors that he can now use Isobel to make her uncle more co-operative.
Arriving outside the IE building, the Doctor contacts the Brigadier and learns that Zoe and Isobel were seen to enter but haven't come out yet. The Doctor decides to bypass the main entrance and use another at the rear by some railway sidings.
They find themselves in a warehouse area filled with large metal cylinders. They observe a workman carrying one of these effortlessly - but when Jamie tries to lift it he finds it impossibly heavy.
Their arrival has been spotted on security cameras and Vaughn alerts Packer. He must use the girls to trap the Doctor and Jamie.
In the warehouse, they hear the girls cry out. When they rush towards the sound they see Zoe's feather boa sticking out from inside one of the cylinders, which Packer is ordering be loaded onto a freight train.
Jamie attacks him, but more guards appear and they are forced to run - only to find their exit blocked.
Packer approaches them, his pistol drawn...

Data:
Written by Derrick Sherwin (from an idea by Kit Pedler)
Recorded: Friday 27th September 1968 - Lime Grove Studio D
First broadcast: 5.15pm, Saturday 9th November 1968
Ratings: 7.1 million / AI 53
VFX: Bill King & Trading Post
Designer: Richard Hunt
Director: Douglas Camfield
Additional Cast: Nicholas Courtney (Brigadier Lethbridge-Stewart), Robert Sidaway (Captain Turner), James Thornhill (Sergeant Walters), Ian Fairbairn (Gregory)


Critique:
If you read the novelisations, or certain early reference materials, UNIT was set up at the Brigadier's personal instigation because of the incident with the Yeti in the Underground. His proposal for a taskforce designed to deal with future events of this sort was accepted, and he was placed in charge of the British division of UNIT. This may well be the case, but it is never specifically set out that way on screen.
Though described as a military / scientific organisation in Sherwin's notes, there is no evidence of the Brigadier actually employing any scientific staff in this story. There are uniformed troops, such as Captain Jimmy Turner and Sergeant Walters, but he also employs plain clothes agents for undercover work, such as the lorry driver in Episode One. Corporal Benton and Tracy are also seen to be wearing civvies as they mount surveillance on the IE building.
Douglas Camfield was involved in the design of the UNIT uniforms, which were of a mushroom colour. Berets were used as their headgear, which bore the UNIT emblem - the initials printed above a circular grid pattern.
Barry Letts hated these uniforms and changed them to conventional British Army dress at the first opportunity - something which Camfield was unhappy about when he returned to the programme to direct Terror of the Zygons.
Camfield did not agree with Lethbridge-Stewart being promoted to Brigadier as this looked wrong on screen, but was purely down to budgetary constraints. A Colonel, he argued in an interview with the DWAS, would have some 900 men to command, and a Brigadier three times that number - yet all the Brigadier ever seemed to have was about half a dozen or so.
The Ministry of Defence were approached to provide help with this production, which was granted when it was seen that the script showed the military in good light.

Filming for this episode began on Tuesday 3rd September at RAF Fairford in Gloucestershire. An RAF Hercules transporter 'plane was provided to act as UNIT's mobile HQ, and RAF personnel acted as UNIT groundcrew for the sequence where the Doctor and Jamie are brought to the site in a Jaguar motorcar.
Geoffrey Cheshire, playing Tracy, actually drove the vehicle onto the plane, even though you can't really see the driver on screen. 
On Saturday 7th September, Millbank Tower in Pimlico was used for scenes of the Doctor and Jamie returning to the IE building. These scenes were filmed at the same time as those for Episode One.
Wednesday 11th then saw Troughton and Hines on Heathfield Street and nearby Walmer Road, Notting Hill, for the sequence where the Doctor and Jamie are pursued and trapped by the cars, then sit down to play cards - a visual ad lib as the pair were always playing card games during breaks in rehearsals. Troughton also suggested the idea that they begin walking slowly in unison then quickly gain speed.
The Production Assistant on this story, who would work frequently on the programme up until The Talons of Weng-Chiang, was Chris D'Oyly John. He lived in Acton and identified the nearby Guinness Factory on Western Avenue as a suitable location for many of the scenes requiring IE's industrial premises, both in London and at their rural compound. Part of the factory was no longer in use.
Cast and crew moved there after the Notting Hill filming, and scenes shot included the Doctor and Jamie breaking into the IE building via railway sidings to its rear. 
We'll talk about the filming here, and what went on after a (very) liquid lunch, when the location features more prominently in the next episode...


Work on the story for Ian Fairbairn was supposed to have included location filming - a sequence where Professor Watkins is rescued - but this had been dropped, so his first involvement was in this episode.
Also joining the cast was Nicholas Courtney, who got back into the swing of rehearsals with Troughton and Hines by participating in their games during the breaks. One popular game was liar dice, where each person takes a turn to roll 5 dice which are hidden from the others. They make a claim as to how many dice of the same score are present. The others then have to bid against the claim, which may be true or false.
One aspect of rehearsals which Courtney did not like was the "fun runs" which Camfield employed to get rid of any nerves or silliness from his actors - playing out the episodes with silly accents, for instance.
Edward Burnham, playing Professor Watkins, was originally supposed to be introduced in this episode, and the actor was initially contracted to also provide the voice of the Cyber-Director. When the scripts were rewritten to have him not appear until later, this role went instead to Peter Halliday.
A number of photographs were taken near Millbank Tower - high angle shots of a number of people which the Brigadier shows to the Doctor and Jamie. Three of these we get a good look at - a scientist named Gordon Jones, Major General Rutlidge and the lorry driver. There are more on the desk, and these are actually photos of the production team: Sherwin, Camfield, Terrance Dicks and Peter Bryant.
The reception computer prop was rigged with smoke charges for when Zoe confounds it with an ALGOL problem.
The Doctor's request for a pat-a-cake biscuit with his tea was another ad lib from Troughton.
Recording breaks were mainly to allow cast members to move from set to set, though one was used to place stage weights in one of the cylinders so that it would look genuinely heavy when Frazer Hines attempted to lift it.
The warehouseman seen carrying the large cylinder is Gordon St Clair who, as Gordon Stothard, had played a Yeti in The Web of Fear and is better known for playing Grun, the King's Champion, in The Curse of Peladon. Another warehouseman is played by John Lord, who had also been a Yeti.
Wendy Padbury and Sally Faulkner had pre-recorded their screams earlier that day.
Neither would be required to work on the following week's episode, meaning a holiday for Padbury.

The earliest surviving episode from this story, it lets us have some idea of what the missing Episode One looked like - but that's pretty much all it gives us beyond the introduction of the Brigadier and UNIT. Not a lot happens otherwise.
We learn that Vaughn is planning an invasion with some unknown power - but then the story is called The Invasion...
Not only does he have a fairly incompetent henchman in Packer, it also appears that his head scientist isn't terribly good at his job either. Presumably all of IE's innovations have come from the Cybermen - but surely they must have been a major global business already for the Cybermen to have agreed to collaborate with Vaughn.
There is some humour in the episode - such as the scene where Zoe wrecks the computer, which even Vaughn finds amusing. Then there are the little bits of business from Troughton such as the card playing on the street; his rather shocked reaction to the Brigadier giving him a TM-45: "Is that a tank?"; and his child-like request for a pat-a-cake biscuit.

Last week we mentioned that paperwork suggested a date of 1976 for this story, whist both Radio Times and the continuity announcer stated that it was set in 1975. Here, the Brigadier says of the business with the Yeti in the Underground: "Must be four years ago now". This would place the events of The Web of Fear around 1971 - whereas Travers had claimed about 40 years had passed since his first encounter with the Doctor, which was dated to 1935. If we went by that dating, then The Invasion should be taking place around 1979.
Discussion of when this story takes place is important, as it will affect the whole chronology of the Cybermen. Remember, they are only supposed to first be encountered by the human race in December 1986 when Mondas returns in The Tenth Planet. We'll look at this later, once they've made their appearance.

The other issue to consider is this mention of "Planet 14".
Wherever this is, it has been visited by the Doctor, in his second incarnation, and Jamie. It may well refer to some unseen story, but if it's one we've seen then there can only really be one contender - Telos.
The Cybermen, being creatures of pure logic, would never give fancy names to planets they have invaded and taken over. They are much more likely to simply code them with a number - i.e. Planet 14 is the fourteenth planet they have taken over. They only used the name Telos as that is what it was called by its original inhabitants, in the same way they continued to call Mondas by the old name it was known by before they became the Cybermen.
One issue with Planet 14 being Telos is, of course, the dating again. The Tomb of the Cybermen definitely takes place in Earth's future, perhaps 500 years after the events of The Moonbase if Viner is to be believed. Up until Attack of the Cybermen, they certainly do not have time travel capabilities, as in that story the time-ship they do have is stolen from someone else - then blown up before they can really exploit it.
Going back to that missile strike in Episode One, it seems that the Cyber-Director only becomes aware of the Doctor's involvement once it has been shown the photographs of himself and Jamie - so that attack was most likely just some automated defence, probably to prevent some conventional Earth satellite from observing the dark side of the Moon.

Trivia:
  • The ratings remain comparatively steady from the previous week, with only slight dips for both figures.
  • Robert Sidaway had previously played Avon in The Savages.
  • Turner is the first of the Brigadier's "Jimmy's" - a succession of different captains prior to the arrival of Mike Yates.
  • Ian Fairbairn is another of Camfield's repertory of actors, though his first appearance in the series was as Questa in The Macra Terror. He will return to the series as technician Bromley in Inferno, and as Dr Chester in The Seeds of Doom.
  • Isobel plays The Teddy Bears Picnic on an old gramophone she says she picked up on London's Portobello Road, famous still for its street market. This song was written and performed by Henry Hall and his Orchestra in 1932. The melody predates the song, being written by American composer John Walter Bratton in 1907.
  • Pat-a-cake biscuits were manufactured by Peek Freans in the first half of the 20th Century. They lent their name to a popular children's nursery rhyme which begins: "Pat-a-cake, pat-a-cake, baker's man, bake me a cake as fast as you can...".
  • It was during the making of this story that Frazer Hines made his stab at pop stardom, with the song Who's Doctor Who. He had met songwriters Barry Mason and Les Reed through his charity football playing. Their hit songs included Who Knows (Where My Rosemary Grows) for Edison Lighthouse, The Last Waltz for Engelbert Humperdink and Delilah for Tom Jones. 
  • Heathfield Street no longer exists, having been turned into car parking and garden spaces for the residents of Portland Road, W11, in the 1970's. The website theundergroundmap.com actually mentions the filming of The Invasion there. The same website claims that Walmer Road is the oldest street in the area, once a footpath known as Greene's Lane.
  • Jon Pertwee was a friend of Chris D'Oyly John's parents, and in an interview once said he dreaded the actor telling them about what went on during location shoots - as it was usually his hotel room which was used for parties. His first work on the series had been as an AFM on The Ark.