The Time Lords send the Doctor and Jo on a mission to deliver a sealed message pod to an unknown party aboard a Skybase orbiting the planet Solos in the 30th century. They are caught quickly in a power struggle between the cruel Marshal of Solos and the young Solonian Ky over the future of Solos - a future that hinges on the contents of the message.

Cast:Jon Pertwee, Katy Manning, Paul Whitsun-Jones, James Mellor, Garrick Hagon, Christopher Coll,

Genre:Science Fiction, Drama, Adventure,

country:United Kingdom,

Production:BBC,