Patrick Troughton

The Doctor

Frazer Hines

Jamie McCrimmon

Wendy Padbury

Zoe Heriot

James Copeland

Selris

James Cairncross

Beta

Gilbert Wynne

Thara

Philip Madoc

Eelek

Terence Brown

Abu

Madeleine Mills

Vana

Richard Ireson

Axus

Maurice Selwyn

Custodian

Bronson Shaw

Student

Roy Skelton

Kroton Voice

Patrick Tull

Kroton Voice

Robert La'Bassiere

Kroton

David Maloney