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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

Miles Northover
Kroton