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Tom Baker
The Doctor

Lalla Ward
Romana II

John Leeson
K9 (voice)

Adrienne Corri
Mena

Laurence Payne
Morix

John Collin
Brock

David Haig
Pangol

Nigel Lambert
Hardin

Martin Fisk
Vargos

Roy Montague
Guide

Ian Talbot
Klout

Harriet Reynolds
Tannoy (voice)

David Allister
Stimson

Clifford Norgate
Generator (voice)

Andrew Lane
Foamasi

Tai Ling
Tourist