Tom Baker
The Doctor
Louise Jameson
Leela
Denis Lill
Dr. Fendelman
Scott Fredericks
Max Stael
Wanda Ventham
Thea Ransome
Edward Arthur
Adam Colby
Daphne Heard
Martha Tyler
Geoffrey Hinsliff
Jack Tyler
Edward Evans
Ted Moss
Graham Simpson
Hiker
Derek Martin
David Mitchell
Elmer Cossey
Camera Operator
George Spenton-Foster
Director
Graham Williams
Producer
Dudley Simpson
Original Music Composer
Delia Derbyshire
Theme Song Performance
Robert Holmes
Script Editor
Chris Boucher
Writer