On the lush planet Tigella, two opposing factions are divided over the usage of the Dodecahedron, an ancient and powerful artefact which provides the entire planet's energy. The Doctor is summoned to arbitrate the conflict, but the power-crazed Meglos intercepts the call and impersonates him in order to steal the Dodecahedron.
Director:
Writer:
Tom Baker
The Doctor / Meglos
Lalla Ward
Romana II
John Leeson
K9 (voice)
Bill Fraser
General Grugger
Frederick Treves
Lieutenant Brotadac
Edward Underdown
Zastor
Jacqueline Hill
Lexa
Colette Gleeson
Caris
Crawford Logan
Deedrix / Meglos (voice) (uncredited)
Christopher Owen
Earthling
Simon Shaw
Tigellan Guard
