

29/10/1966
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.

William Hartnell
as The Doctor (1)

Anneke Wills
as Polly

Michael Craze
as Ben Jackson

Patrick Troughton
as The Doctor (2) (uncredited)

Robert Beatty
as General Cutler

David Dodimead
as Barclay

Dudley Jones
as Dyson

Alan White
as Schultz

Earl Cameron
as Williams

Callen Angelo
as Terry Cutler

John Brandon
as American Sergeant

Shane Shelton
as Tito

Steve Plytas
as Wigner

Christopher Matthews
as Radar Technician

Ellen Cullen
as Geneva Technician

Christopher Dunham
as R/T Technician

Glenn Beck
as TV Announcer

Roy Skelton
as Cybermen (voice)

Peter Hawkins
as Cybermen (voice)

Harry Brooks
as Cyberman

Reg Whitehead
as Cyberman

Gregg Palmer
as Cyberman
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