The Doctor and Taslo were sent on a mission by Division to find and destroy a serious threat to Gallifrey. Upon arrival, they learned not only was there no threat, but that the Colonists they met were divergent Time Lords! Something sinister is afoot, and the Doctor is going to uncover the truth... BBC logo © BBC 1996. Doctor Who logo and insignia © BBC 2018. Thirteenth Doctor images © BBC Worldwide 2018. Licensed by BBC Worldwide Limited.