Torchwood episode 15: Sleeper (23/1/2008)
‘I thought the end of the world couldn’t get any worse.’ A routine episode that’s sharper than the first series, largely built around Nikki Amuka-Bird’s sympathetic central performance as the sleeper agent. Thematically, it begins where Doctor Who: Utopia ended: with a human revealed to be an alien monster in hiding (perhaps his experiences at the end of the universe have given Jack an extra-ruthless intensity when it comes to exposing the sleeper). From there, it goes down a different route, with Beth’s humanity not erased by the alien inside, but constantly struggling to reassert itself until the predictably tragic conclusion.