The Doctor and Taslo tried to save the Colonists from the wrath of Gallifrey, but upon locating the Time Lord councillor responsible, he revealed Taslo as a traitor! At their mercy, the Doctor was forced to watch as they destroyed all the colonised planets... BBC, DOCTOR WHO, TARDIS and DALEK (word marks and logos) are trade marks of the British Broadcasting Corporation and are used under licence. BBC logo © BBC 1996. Doctor Who logo © BBC 2018. Thirteenth Doctor images © BBC Studios 2018. Dalek image © BBC/Terry Nation 1963. Licensed by BBC Studios.