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...
Genres:
Tom Baker as The Doctor
Elisabeth Sladen as Sarah Jane Smith
Frederick Jaeger as Sorenson
Ewen Solon as Vishinsky
Prentis Hancock as Salamar
Graham Weston as De Haan
Louis Mahoney as Ponti
Michael Wisher as Morelli
Terence Brook as Braun
Tony McEwan as Baldwin
Haydn Wood as O'Hara
Melvyn Bedford as Reig
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