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Tom Baker
The Doctor

Lalla Ward
Romana

Matthew Waterhouse
Adric

John Leeson
K9 (voice)

Clifford Rose
Rorvik

Kenneth Cope
Packard

David Kincaid
Lane

Freddie Earlle
Aldo

Harry Waters
Royce

David Weston
Biroc

Vincent Pickering
Sagan

Robert Vowles
Gundan

Jeremy Gittins
Lazlo