The Doctor
Patrick Troughton
Jamie McCrimmon
Frazer Hines
Custodian
Maurice Selwyn
Student
Bronson Shaw
Kroton Voice
Roy Skelton
Patrick Tull
Kroton
Robert La'Bassiere
Miles Northover
Zoe Heriot
Wendy Padbury
Selris
James Copeland
Beta
James Cairncross
Thara
Gilbert Wynne
Eelek
Philip Madoc
Abu
Terence Brown
Vana
Madeleine Mills
Axus
Richard Ireson
Director
David Maloney
Script Editor
Terrance Dicks
Writer
Robert Holmes
Producer
Peter Bryant
Music
Brian Hodgson