Doctor Who: The Power of Kroll

Directed by Norman Stewart

With Tom Baker, Mary Tamm, Neil McCarthy, John Abineri and Philip Madoc

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.