

October 29, 1966
1h 34m
EN
Derek Martinus
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
The Doctor (1)

Anneke Wills
Polly

Michael Craze
Ben Jackson

Patrick Troughton
The Doctor (2) (uncredited)


Kit Pedler, Gerry Davis
13

Robert Beatty
General Cutler

David Dodimead
Barclay

Dudley Jones
Dyson

Alan White
Schultz

Earl Cameron
Williams

Callen Angelo
Terry Cutler