While an exhausted Doctor falls asleep, a robot steals blueprints for a disintegrator gun.

The Doctor helps the Brigadier investigate the culprit behind a series of crimes.

The Doctor and Sarah realize that Hilda Winters, a director for Think Tank, programmed the robot that stole a disintegrator gun. The organization planned to start a nuclear war, eventually win and rule the world.

While Think Tank hides in a bunker waiting for the nuclear holocaust to begin, the Doctor is in a frantic effort to stop the organization from achieving their goal of world domination.

An anachronistic twelve-million-year-old human skull has been discovered by archaeologists and is now being used by Professor Fendelman in his time scanner experiments at Fetch Priory in contemporary England. The skull is actually an artifact of the Fendahl, an ancient creature that feeds on the life force of others.

The Doctor wins a trip.

Assassins stalk Delta.

The newly regenerated fifth doctor must rely on his friends to survive the generation.

A mysterious woman who can't even remember her own name, falls from the sky.

The Tardis materialises on a massive Urbankan starship filled with ancient ethnic groups.

The Kinda is apparently a primitive tribe but three team members have already vanished.