The Doctor finds himself caught in the conflict between a marsh moon's native Swampies and the crew of a chemical refinery. Things take a turn for the worse when the Doctor uncovers the Swampies' plot to awaken Kroll, the giant god that lives beneath the marsh.

The TARDIS arrives on a Minyan space craft, the R1C, commanded by a man named Jackson. Jackson and his crew are on a long quest to recover the Minyan race banks from a ship called the P7E which left their planet centuries ago. The Doctor helps to free the R1C after it becomes buried in a meteorite storm, but it then crashes into another newly-formed planet.

Leela is to be executed.

The alien-controlled company is exposed and the Doctor tries to incite a rebellion among the workers.

While on a holiday at a 23rd-century recreation planet, the Doctor encounters a grisly accident and murder.