Cast 8
Tom Baker
The Doctor
Louise Jameson
Leela
John Leeson
K-9 Mk. I (voice) / Nucleus (voice)
Michael Sheard
Lowe
Brian Grellis
Safran
Jay Neill
Silvey
Edmund Pegge
Meeker
Frederick Jaeger
Professor Marius
Crew 7
Derrick Goodwin
Director
Dave Martin
Writer
Bob Baker
Writer
Robert Holmes
Script Editor
Graham Williams
Producer
Dudley Simpson
Original Music Composer
Delia Derbyshire
Theme Song Performance