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.
Cast
William Hartnell
The Doctor (1)
Anneke Wills
Polly
Michael Craze
Ben Jackson
Patrick Troughton
The Doctor (2) (uncredited)
Robert Beatty
General Cutler
David Dodimead
Barclay
Dudley Jones
Dyson
Alan White
Schultz
Earl Cameron
Williams
Callen Angelo
Terry Cutler
John Brandon
American Sergeant
Shane Shelton
Tito
Steve Plytas
Wigner
Christopher Matthews
Radar Technician
Ellen Cullen
Geneva Technician
Christopher Dunham
R/T Technician
Glenn Beck
TV Announcer
Roy Skelton
Cybermen (voice)
Peter Hawkins
Cybermen (voice)
Harry Brooks
Cyberman
Reg Whitehead
Cyberman
Gregg Palmer
Cyberman
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