Peter Dyneley
Jeff Tracy / Professor Wingrove / NTBS Reporter / Crane Chief (voice)
Sylvia Anderson
Lady Penelope Creighton-Ward (voice)
Shane Rimmer
Scott Tracy (voice)
David Holliday
Virgil Tracy (voice)
Matt Zimmerman
Alan Tracy / Bill Craddock / 2nd NTBS Reporter (voice)
David Graham
Gordon Tracy / Parker / Brains / Dave Clayton / Frank / Chuck / Policeman (voice)
Ray Barrett
John Tracy / Allington Bridge Controller / Kirby / Dr R. G. Korda (voice)
Christine Finn
Tin-Tin Kyrano / Grandma Tracy (voice)
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