The Doctor - Peter Davison
Tegan - Janet Fielding
Turlough - Mark Strickson
Black Guardian - Valentine Dyall
Collier - Clive Kneller
First Officer - James McClure
Jackson - Tony Caunter
Mansell - Leee John
Marriner - Christopher Brown
Striker - Keith Barron
White Guardian - Cyril Luckham
Wrack - Lynda Baron