출연진
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