William Hartnell

The Doctor

Carole Ann Ford

Susan Foreman

Jacqueline Hill

Barbara Wright

William Russell

Ian Chesterton

George Coulouris

Arbitan

Martin Cort

Voord / Warrior / Ice Soldier / Aydan

Peter Stenson

Voord / Ice Soldier / Second Judge

Gordon Wales

Voord

Robin Phillips

Altos

Katherine Schofield

Sabetha

Heron Carvic

Voice of Morpho (voice)

Edmund Warwick

Darrius

Francis de Wolff

Vasor

Michael Allaby

Ice Soldier / Larn

Alan James

Ice Soldier / First Judge / Guard

Anthony Verner

Ice Soldier

Henley Thomas

Tarron

Raf De La Torre

Senior Judge

Fiona Walker

Kala

Donald Pickering

Eyesen

Stephen Dartnell

Yartek

Dougie Dean

Eprin (uncredited)