
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
Crew
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