Synopsis:
The three Daleks sent to Maxtible's home from Skaro have had the "Human Factor" added to their brains. Instead of lethal cunning, they exhibit playful friendliness...
Maxtible leaves the laboratory, satisfied that the experiment has been a success.
After their game of "trains", the Doctor marks each of them with a symbol - naming them Alpha, Beta and Omega. He tells them that he and Jamie are their friends.
After spending some time with the trio, they suddenly announce that they must return to Skaro. All of the Daleks in the house have been recalled.
The Doctor and Jamie set off to look for Victoria as Maxtible returns with Waterfield, who wants to know where his daughter is now that the Dalek experiment is completed. Waterfield lies, claiming she is probably out in the garden. He goes to look for her as a Dalek sets a large box in the middle of the floor.
Maxtible wants to know what this is but is ordered not to touch it. He demands that the Daleks give him the formula they promised him but is only ordered to fetch the Doctor and Jamie. This is overheard by Waterfield as he returns.
Not trusting his old acquaintance and realising that there is more going on here than he has been told, he tries to force Maxtible into telling him the truth. Maxtible knocks him out, then tells a newly arrived Dalek that he hasn't been able to find the Doctor and Jamie.
It tells him that the device on the floor is a powerful bomb which is timed to go off in a few minutes. He is horrified at the thought of losing his home - especially his laboratory, as he believes that without it the knowledge they will give him will be useless as he will not be able to exploit it.
He is forced to enter the time cabinet and leave with the Dalek.
Waterfield has revived and heard them speak about about the bomb, and he warns the Doctor and Jamie as they return, having found no trace of Victoria.
Unable to deactivate the device, they are unable to use the time cabinet either as it is now simply an empty shell.
The Doctor then recalls the time travel machine which Waterfield had used to travel to 1966. They quickly set it up and activate it as the bomb detonates, destroying the house.
Victoria and Kemel are being held captive in a cell in the Dalek city on Skaro. Maxtible joins them briefly, before being escorted away by a Dalek.
The Doctor, Jamie and Waterfield have arrived on a plateau overlooking the city. The Doctor recalls a cave system nearby which will allow them to enter unobserved.
Maxtible, meanwhile, is having to answer to a black-domed Dalek why he did not bring the Doctor with him.
One of these Black Daleks has noticed a mark on another's casing, and it explains that it was made by the Doctor. It is Omega.
Victoria and Kemel hear an alarm sound as the Daleks announce intruders detected in their city, and she hopes that it is her father come to rescue them.
She is then taken from the cell to join Maxtible in a darkened chamber. She hears him scream out, then is made to do so herself. This is a ruse by the Daleks to lure the intruders into a trap.
They, meanwhile, are moving along a narrow ledge when they are confronted by a Dalek. It proves to be Omega, come to escort them the rest of the way. The Doctor suddenly pushes it off the ledge into a deep chasm, as he has noted that it is not his writing on the casing.
They enter the city and are confronted by two Black Daleks which force them to accompany it.
They enter a darkened chamber and hear a voice booming out from the shadows. A light comes on and a massive static Dalek is revealed. The Doctor identifies it as their Emperor.
He tells it that the day of the Daleks is coming to an end. Somewhere in the city are three Daleks with the "Human Factor". They will come to question their orders and this will sow discontent which will spread. Rebellion will follow.
The Emperor reveals that the TARDIS is here, then explains that the "Human Factor" was merely a means to an end. It has helped to identify a "Dalek Factor".
The Doctor will be forced to take this to Earth in the TARDIS and spread it throughout the whole of human history...
Data:Written by David Whitaker
Recorded: Saturday 17th June, 1967 - Lime Grove Studio D
First broadcast: 5.45pm, Saturday 24th June 1967
Ratings: 6.8 million / AI 49
VFX: Michealjohn Harris & Peter Day
Designer: Chris Thompson
Director: Derek Martinus
Critique:Unlike the other six instalments, there is no record of any working title for this episode from its writer. The novelisation of the repeat showing, by Frazer Hines, which uses these working titles as chapter headings employs "Escape to Danger".
One of the things which Terry Nation disliked about this story was the introduction of an Emperor. He had been content with the Black Dalek Supreme.
We all know that the comic strips published in TV Century 21 comic were the work of David Whitaker, and not Nation, and he had introduced an Emperor there. That had been a distinctive (flidor) gold one, with a spherical upper half and multiple dome lights. It was the Dalek which had confronted the last two natural Dal people when they emerged after the nuclear disaster which befell Skaro, and which forced them to create more of its kind before they succumbed to radiation sickness. As the first, it elected to make itself their ruler and had a special casing built for itself.
Also introduced this week are the Emperor's special retinue which have senior status over the normal silver Daleks. The script refers to them as "Black Daleks", though they obviously only have a black dome and are otherwise identical to the standard model. This is the only story in which this colour scheme appears.
There were five Daleks available for the whole serial, which had easily replaceable domes to switch from silver to black as the scenes dictated.
In the draft script for Episode 6, the Doctor told Jamie and Waterfield that he had found a way to destroy the Daleks for good - "by making them all like us".
Their city was described as "piercing out of the sand of the desert, with a mountain range to the side... its weird shaped buildings, pillars and projections making up a kind of alien symmetry". No doubt Whitaker was recalling the model city designed by Ray Cusick for their debut, which had featured a mountainous backdrop.
The model was mainly built from balsa wood.
Filming for this episode was limited to model shots, recorded at Ealing on Wednesday 26th April. These were establishing shots of the city, to be seen by the Doctor and his friends as they first arrive on Skaro, plus the use of a Louis Marx toy Dalek for the sequence where the Doctor pushes the fake Omega into the chasm.
On Friday 16th June, Patrick Troughton, Frazer Hines and Deborah Watling were released from rehearsals to film the opening sequence for the next story, where Victoria is introduced to the TARDIS.
Recording seems to have been a mix of tension and humour. Some of the younger cast members raced around the studio in the Dalek bases during the afternoon, and apparently it was whilst making this episode that Hines, trying out one of the props, overheard certain cast members slagging off the director in particular and the programme in general.
Hines devised the double-entendre "Look at the size of those balls, Doctor!" when first seeing the Emperor. Comments on size would become a running joke with him, sometimes even making it to broadcast, unlike here.
Murphy Grumbar joined Robert Jewell, Gerald Taylor and John Scott Martin to operate a fourth Dalek prop.
As previously mentioned, Peter Hawkins had his voice duplicated and overlaid to provide the deep booming vocals of the Emperor - the voice previously heard in Arthur Terrall's head.
To relieve a moment of tension in studio, Roy Skelton decided to sing "What's it all about, Alpha?" in Dalek voice - a play on the Cilla Black song which accompanied the Michael Caine movie Alfie, which had opened in March the year before.
There were three recording breaks scheduled. The first after the action leaves the laboratory, the second following the Doctor's destruction of the Dalek on the cave tunnel set, and the third just before the final scene with the Emperor.
This large static prop was initially kept in shadow, then illuminated by a spotlight. The Dalek city interior was composed mainly of white angular supports, which could be rearranged into different permutations to represent various chambers and corridors, set against black drapes.
The Emperor had as part of its dome a segment of a Chumbley, from Galaxy 4.
The TARDIS prop had its doors hung the wrong way round.
There were two small trims made during editing. The first was a shot of the Doctor's party moving through the tunnel system, and the other was a model shot of a toy Dalek moving along the bottom of the chasm.
After an enjoyable instalment which saw the Doctor and Jamie as fish-out-of-water visitors to contemporary Chelsea, the story had moved to Victorian Kent, restricted to the confines of Theodore Maxtible's country house, where Jamie's rescue of Victoria was certainly the most exciting part. If there was padding, it has been well and truly ditched with the departure of those extraneous characters who inhabited the house.
Episode Six now sees the action shift to the Dalek homeworld of Skaro. It's this final section of the story which is best remembered by fans who saw it at the time (on first or repeat broadcast) and it could be argued that it's the bit which most of us would like to see found. The Daleks have worked well in the gothic environs of the house, mainly because many of their scenes were filmed on location at night, but a high tech environment like their city does seem to be their natural habitat.
Before we get there we have the humorous opening scenes of the playful Daleks, making the Doctor play "trains" with them. Nation would not doubt have cringed at scenes of them playing and chanting about "Dizzy Daleks", or the sing-song "Alpha, Beta, Omega. Alpha, Beta, Omega...".
This episode gives guest star Marius Goring more to do at last. John Bailey's Waterfield has had more of a presence up to now, whilst Maxtible has tended to merely flit in and out of the laboratory, fluffing lines - calling Waterfield "Whitefield" at one point, and claiming the Daleks hail from a planet named Skarov. With the experiment out of the way, and those other characters jettisoned, the story can concentrate more on him and his obsession with alchemical secrets, and the relationship which he believes he has with the Daleks.
The city clearly does not resemble the one seen in The Daleks. Not just in its architecture, which can obviously change over the centuries, but also in the geographical location. The city seen previously sat on a plain, with mountains behind, whilst this one has higher ground all around it.
The Doctor also seems to know all about the tunnel system leading into it, which he claims he recalls from his previous visit. If it's the tunnels which Ian's party used to infiltrate the city then they don't look the same, and he was never seen to enter them anyway. It may well be that he explored off camera between the defeat of the Daleks and the farewell scenes by the TARDIS. An alternative is that this is another city altogether (an idea which some fans have raised to explain how the Daleks could all be destroyed in their debut, and yet still be around later). If this is the case, then the Doctor can't possibly know about the secret tunnel entrance - unless there has been some unseen adventure on Skaro in the interim.
We have to question why, if the Daleks know about the tunnel (and they do, as they send the fake Omega along it) it isn't properly guarded.
Trivia:- After a gradual decline, the ratings show a massive improvement this week - up 1.7 million viewers. The appreciation figure drops below 50, however.
- The repeat screening was at 5.15pm on Saturday 27th July 1968, when it was watched by an audience of 4.2 million - the lowest of the run - but with a higher AI of 51.
- When Russell T Davies introduced a new Emperor Dalek in Parting of the Ways, he had it served by black-domed versions of the standard bronze Daleks as a nod to this story. There was also a visual clue to the Emperor in the previous episode as we see the Controller of the Game Station permanently wired into its systems, and there's a familiar hexagonal pattern left behind when she gets teleported away.
- A Black Dalek was amongst the inmates of the Asylum of the Daleks, not that you could actually spot it very well. Matt Smith and Karen Gillan actually claimed it as their favourite of the classic models and were photographed with it.
- Radio Times this week featured a piece on Marius Goring, to tie in with the broadcast of this sixth episode:

- There is a recreation of the Dalek Emperor on display at the Adventures in Time and Space exhibition in Peterborough's art gallery and museum, running to October 2025.
- And a Black Dalek was a regular fixture of the Doctor Who Experience throughout its run. Presumably this was the prop which, dirtied down, had featured in Asylum of the Daleks...