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Derek Martinus
Director
Kit Pedler, Gerry Davis
Writers
Rate
Diary
The Doctor's TARDIS lands at the Snowcap space tracking station in Antarctica in December 1986. A routine space mission starts going wrong. When the base personnel's suspicions are roused, the Doctor informs them that the space capsule is being affected by the gravitational pull of another planet — a tenth planet in the Solar system.
Robert Beatty
General Cutler