Casting de Alerte dans le cosmos
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Jack PalanceOmus
Carol LynleyNikki
Barry MorseDr. John Caball
John IrelandSenator Smedley
Nicholas CampbellJason Caball
Anne-Marie MartinKim Smedley- Greg SwansonSparks (voice)
- Mark ParrSparks
William HuttLomax (voice)
Ardon BessMerrick
Lynda Mason GreenLunar technician- Albert HumphriesRobot technician
Bill LakeSpacesuited man