Leslie Winner is one of the good guys. But he's forever finding himself in self-inflicted trouble. Despite his calamitous nature, he's found someone who'll put up with him - his fiancee Jemma. They're getting ready for their wedding, and if Leslie's going to pay for the honeymoon, he needs to find a job. And somehow manage not to get the sack. This loveable klutz is never far from a fresh disaster. Decorating a house, badly, with a paint gun. Wearing slippers to a high-pressure interview. A self-playing piano in a restaurant. Can Leslie stay out of trouble long enough to walk up the aisle with Jemma?

The TARDIS arrives in the future on the planet Pluto where there are now six suns, a breathable atmosphere and a large industrial community. The Company controls the planet and exploits the workers, pays them a pittance and then taxes them on everything imaginable. The Doctor and Leela join forces with an underground band of rebels led by a man named Mandrel.

The TARDIS arrives on a planet where a savage tribe called the Sevateem worship a god called Xoanon. The Doctor discovers that Xoanon is in fact a spaceship computer that he tried to repair at some point in his past and inadvertently drove mad by giving it a multiple personality.

The Doctor is uncertain about his future.

The Doctor confronts the Valeyard in the Matrix.

The White Guardian recruits the Doctor. The Doctor is sent on a quest to collect the six segments of the Key of Time that are scattered throughout the universe.

In order to find the second segment, the Doctor must defeat the Captain of Zanak, a hollow ship which absorbs the natural energy of planets.

The Doctor and Romana arrive on scene where they meet Professor Amelia Rumford and her assistant Vivien Fay, who are working around the stone circle. When the Doctor discovers a spaceship hovering over the circle, his life is jeopardized.