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Tom Baker
The Doctor
Louise Jameson
Leela
John Leeson
K-9 Mk. I (voice) / Nucleus (voice)
Michael Sheard
Lowe
Brian Grellis
Safran
Jay Neill
Silvey
Edmund Pegge
Meeker
Frederick Jaeger
Professor Marius
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Released
BBC
Derrick Goodwin
Director
Dave Martin
Writer
Bob Baker
Robert Holmes
Script Editor
