The Doctor and Romana arrive on the marsh moon of Delta Magna in search of the next segment of the Key to Time. They are caught in the conflict between the native Swampies and the crew of a chemical refinery. The presence of a gun runner complicates matters; to make things worse, the Swampies intend to awaken Kroll, the giant god that lives beneath the swamps.

Genres

Cast

Tom Baker

The Doctor

Mary Tamm

Romana

Neil McCarthy

Thawn

John Abineri

Ranquin

Philip Madoc

Fenner

Glyn Owen

Rohm-Dutt

Carl Rigg

Varlik

John Leeson

Dugeen