Picking up a distress call from the edge of the known universe, the Doctor and Sarah Jane find themselves on Zeta Minor where a geological team has run afoul of some strange goings on...
Director:
Writer:
Tom Baker
The Doctor
Elisabeth Sladen
Sarah Jane Smith
Frederick Jaeger
Sorenson
Ewen Solon
Vishinsky
Prentis Hancock
Salamar
Graham Weston
De Haan
Louis Mahoney
Ponti
Michael Wisher
Morelli
Terence Brook
Braun
Tony McEwan
Baldwin
Haydn Wood
O'Hara
Melvyn Bedford
Reig
