The Doctor

William Hartnell

Susan Foreman

Carole Ann Ford

Voice of Morpho (voice)

Heron Carvic

Darrius

Edmund Warwick

Vasor

Francis de Wolff

Ice Soldier / Larn

Michael Allaby

Ice Soldier / First Judge / Guard

Alan James

Ice Soldier

Anthony Verner

Tarron

Henley Thomas

Senior Judge

Raf De La Torre

Kala

Fiona Walker

Eyesen

Donald Pickering

Barbara Wright

Jacqueline Hill

Yartek

Stephen Dartnell

Eprin (uncredited)

Dougie Dean

Ian Chesterton

William Russell

Arbitan

George Coulouris

Voord / Warrior / Ice Soldier / Aydan

Martin Cort

Voord / Ice Soldier / Second Judge

Peter Stenson

Voord

Gordon Wales

Altos

Robin Phillips

Sabetha

Katherine Schofield

Writer

Terry Nation

Producer

Verity Lambert

Associate Producer

Mervyn Pinfield

Music

Norman Kay

Costume Design

Daphne Dare

Script Editor

David Whitaker

Director

John Gorrie

Makeup & Hair

Jill Summers