- Patrick Jordan - Photo Lab Aide
- Howard Lang - Naval Commader, at the "Valkyrie" wreck (uncredited)
- Leonard Sachs - Dialogue Scientist at Conference (bit)
- Ernest Blyth - Scientist at Conference (uncredited)
- Neal Arden - TV Newscaster (uncredited)
- Paul Beradi - Man Listening to Car Radio (uncredited)
- Max Faulkner - PLA Radio Operator (uncredited)
- Neil Hallett - Dr. Sampson's Helicopter Pilot (uncredited)
- André Maranne - French Radio Officer (uncredited)
- Derren Nesbitt - The Radar Operator, at the radar room (uncredited)
- Guy Standeven - Naval Officer in Situation Room (uncredited)
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Costa Botes
Capítulo disponible en las siguientes plataformas: