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"A life cycle unique in the history of the universe. And now, thanks to the Marshal, threatened with extinction"
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When a strange message pod turns up at UNIT HQ, the Doctor and his assistant Jo are suddenly involved in another dangerous mission for the Time Lords. The TARDIS takes them to Skybase One above the inhospitable Solos. It is the 30th Century and the planet is about to gain independence from Earth's glorious empire. But someone on Solos has other plans and, alarmingly, the natives are slowly mutating into fierce-looking creatures. It's time for the Doctor and Jo to find out why.
The Doctor: Jon Pertwee
Jo Grant: Katy Manning
The Marshal: Paul Whitsun-Jones
Ky: Garrick Hagon
Administrator: Geoffrey Palmer
Jaeger: George Pravda
Sondergaard: John Hollis
Stubbs: Christopher Coll
Cotton: Rick James
Producer: Barry Letts
Director: Christopher Barry
Scriptwriters: Bob Baker and Dave Martin