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Reparto

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