Recap: Doctor Who S15 E5 "Underworld"
Jason and the Argonauts: The Next Generation
The Quest is the Quest!
— Various Minyans
The TARDIS lands on a spaceship, the R1C, commanded by a man named Jackson. He and his Minyan crew are on a quest to recover their "race banks" from another ship, the P7E, which left a hundred thousand years ago to form a new colony. The Time Lords, who are seen as Gods by the Minyans, shared a form of regeneration with them but left as soon as the Minyans turned on them. Jackson's quite
surprised to see a God suddenly standing in the middle of his spaceship, but the team doesn't have time to be surprised, as the R1C is buried by a meteor storm. Rocks gather around the spaceship's gravitational field, instantly forming the beginnings of a planet. The Doctor helps them escape, and they crash into another small planet just as the serial's budget runs out.
Investigating the planet, the Doctor and Leela are awkwardly projected onto a photo background and find a system of caves that leads to the P7E, long ago buried by asteroids. The P7E's computer, Oracle, has gone insane and rules over the survivors of the Minyan crew with the aid of the robotic Seers. It allows Jackson to take the race banks, but the Doctor realises that they are just fakes, primed with fission grenades. The Doctor herds the P7E's descendants into the R1C and gives Jackson a rather grand What the Hell, Hero?
speech for considering the quest more important than the actual people the quest was all about. After that, Four tricks Oracle into allowing him to take the real race banks, meanwhile returning the fakes via the Seers. The resulting explosion destroys the P7E and propels the R1C off on its voyage to Minyos II with the P7E's survivors.