Ηθοποιοί επεισοδίου
Jon PertweeThe Doctor
Nicholas CourtneyThe Brigadier
Caroline JohnLiz Shaw
John LeveneSergeant Benton
Ronald AllenRalph Cornish
★
Dallas CavellQuinlan
William DysartReegan
Cyril ShapsLennox
★
Steve PetersAstronaut
★
Neville SimonsAstronaut
★
Ric FelgateAstronaut
★
Tony HarwoodFlynn
★
James ClaytonPrivate Barker
★
Joanna RossControl Room Assistant