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.

Genres

Cast

William Hartnell

The Doctor (1)

Anneke Wills

Polly

Michael Craze

Ben Jackson

Patrick Troughton

The Doctor (2) (uncredited)

Robert Beatty

General Cutler

Earl Cameron

Williams

John Brandon

American Sergeant

Steve Plytas

Wigner

Christopher Matthews

Radar Technician

Glenn Beck

TV Announcer

Roy Skelton

Cybermen (voice)

Peter Hawkins

Cybermen (voice)