Tom Baker

The Doctor

Mary Tamm

Romana

Neil McCarthy

Thawn

John Abineri

Ranquin

Philip Madoc

Fenner

Glyn Owen

Rohm-Dutt

Carl Rigg

Varlik

Frank Jarvis

Skart

John Leeson

Dugeen

Grahame Mallard

Harg

Robert Holmes

Writer

Anthony Read

Script Editor

Graham Williams

Producer

John Nathan-Turner

Producer

Norman Stewart

Director

Dudley Simpson

Original Music Composer

Delia Derbyshire

Theme Song Performance