All Cast

Tom Baker

Tom Baker

The Doctor

Louise Jameson

Louise Jameson

Leela

John Leeson

John Leeson

K-9 Mk. I (voice) / Nucleus (voice)

Michael Sheard

Michael Sheard

Lowe

Brian Grellis

Brian Grellis

Safran

Jay Neill

Jay Neill

Silvey

Edmund Pegge

Edmund Pegge

Meeker

Frederick Jaeger

Frederick Jaeger

Professor Marius