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.
The Doctor / Meglos
Romana II
K9 (voice)
General Grugger
Lieutenant Brotadac
Zastor
Lexa
Caris
Deedrix / Meglos (voice) (uncredited)
Earthling
Tigellan Guard
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