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| Sylvia Anderson | Lady Penelope Creighton-Ward |
| Ray Barrett | John Tracy/The Hood |
| Alexander Davion | |
| Peter Dyneley | Jeff Tracy |
| Christine Finn | Tin-Tin |
| David Graham | Gordon Tracy/Brains |
| Paul Maxwell | Captain Paul Travers |
| Neil McCallum | Dr. Ray Pierce |
| Bob Monkhouse | Space Navigator Brad Newman/Swinging Star Compere |
| Shane Rimmer | Scott Tracy |
| Charles ``Bud'' Tingwell | Dr.. Tony Grant/Angry Young Man/Public Relations Officer |
| Jeremy Wilkin | Virgil Tracy/Space Exploration Center President |
| Matt Zimmerman | Alan Tracy/Messenger |
A 21st-century astronaut and his sons hunt for the saboteur plotting against a proposed flight to Mars.
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