Calificación
Reparto

Tom Baker
The Doctor

Elisabeth Sladen
Sarah Jane Smith

Stephen Thorne
Kastrian Eldrad

Judith Paris
Eldrad (female form)

Roy Pattison
Zazzka

Roy Skelton
King Rokon

Rex Robinson
Dr. Carter

Glyn Houston
Professor Watson

Frances Pidgeon
Miss Jackson

John Cannon
Elgin

David Purcell
Abbott

Renu Setna
Intern

Robin Hargrave
Guard

Roy Boyd
Driscoll