Jason and Paul join the 12th Doctor on the red planet, during the 1800s, in the episode "The Empress of Mars."  The Doctor and Bill find Victorian, British troops in the last place they should be... on the planet Mars!  As a prequel to the classic episodes, get ready to discover the Ice Warriors, meet Catchlove, and experience the first true appearance of Alpha Centauri!  Also, what the heck is going on with Missy?!?!