Part 1

Image for Part 1Not currently available on BBC iPlayer

Duration: 25 minutes

Landing at the South Pole, the travellers find that Earth's twin planet is disrupting a space mission. The Doctor predicts that they will soon receive visitors from the new planet.

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Credits

Doctor Who
William Hartnell
Polly
Anneke Wills
Ben Jackson
Michael Craze
Krang
Harry Brooks
Williams
Earl Cameron
Barclay
David Dodimead
Dyson
Dudley Jones
Shav
Gregg Palmer
Wigner
Steve Plytas
Tito
Shane Shelton
Schultz
Alan White
General Cutler
Robert Beatty
Radar Technician
Christopher Matthews
American Sergeant
John Brandon
Krail
Reg Whitehead
Director
Derek Martinus
Producer
Innes Lloyd
Writer
Kit Pedler

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