Ky transports himself and Jo down to Solos and the Marshal only agrees to help her if the Doctor assists Professor Jaeger in altering Solos' atmosphere.
Quest roles:
John Scott Martin(Dalek Operator), Terry Walsh(Guard (uncredited)), George Pravda(Castellan Spandrell), Paul Whitsun-Jones(Marshal), James Mellor(Varan), Garrick Hagon(Ky), Christopher Coll(Stubbs), Jonathan Sherwood(Varan's Son), Rick James(Cotton)