Cast

Tom Baker

The Doctor

Elisabeth Sladen

Sarah Jane Smith

Ian Marter

Harry Sullivan

Nicholas Courtney

Brigadier Lethbridge-Stewart

John Levene

RSM Benton

John Woodnutt

Duke of Forgill / Broton

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Keith Ashley

Zygon

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Ronald Gough

Zygon

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Lillias Walker

Sister Lamont

Angus Lennie

Angus

Crew

Douglas Camfield

Director (Directing)

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Robert Banks Stewart

Writer (Writing)

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Geoffrey Burgon

Original Music Composer (Sound)

Philip Hinchcliffe

Producer (Production)

Robert Holmes

Script Editor (Writing)