Cast (13)

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

Keith Ashley

Zygon

Ronald Gough

Zygon

Lillias Walker

Sister Lamont

Angus Lennie

Angus

Tony Sibbald

Huckle

Hugh Martin

Munro

Robert Russell

The Caber

Crew (5)

Douglas Camfield

Director

Robert Banks Stewart

Writer

Geoffrey Burgon

Original Music Composer

Philip Hinchcliffe

Producer

Robert Holmes

Script Editor