G is for... Gray

Younger brother of Captain Jack Harkness. They grew up in a colony on the Boeshane Peninsula The community came under frequent attacks by unseen creatures, which swept down from the skies and carried people off. Gray was taken during one of these raids, and Jack spent the rest of his life blaming himself as he was supposed to look after him.
Whilst leading Torchwood Three in Cardiff, Jack encountered an old Time Agent colleague named Captain John Hart, who revealed that he had found Gray.
Some weeks later, the team were lured into a trap - sent to investigate a building which had been mined with explosives. The culprit appeared to be Hart, and he sent a hologram to Jack showing Gray with him. A number of bombs them went off around the city, and Jack was attacked and shot by Hart. He was then taken back in time to the period before the city had been founded, where he would be forced to dig his own grave before being buried alive. Jack discovered that this was the work of Gray, who had been driven insane by his experiences in captivity and now sought revenge on the brother who had abandoned him. Gray was forcing Hart to work for him. Gray's attack on the city led to the final death of Dr Owen Harper - trapped in a nuclear power station control room which was about to flood with disintegrating radiation. Gray also fatally wounded Toshiko Sato back at the Torchwood Hub. Hart had managed to hide a transmitter in Jack's grave, so that the Victorian era Torchwood team would locate him and disinter him. He had them put his body in cryogenic suspension in the Hub morgue - programmed to reawaken automatically on the day of Gray's attack. Jack overpowered Gray using chloroform and - unable to kill him even after all the deaths he had caused - had him frozen in the morgue. Presumably he would have been killed when the Hub was later totally destroyed in a bomb blast.

Played by: Lachlan Neiboer, Ethan Brook (young Gray). Appearances: TW 2.5 Adam, TW 2.13 Exit Wounds (2008).

• Nieboer was also seen fleetingly as a hologram of Gray at the conclusion of TW 2.12 Fragments, although he wasn't credited.