Overview

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.

Details

Cast

William Hartnell

Anneke Wills

Michael Craze

Patrick Troughton

Robert Beatty

David Dodimead

Dudley Jones

Alan White

Earl Cameron

Callen Angelo