Brains and Lady Penelope find themselves involved in a rescue mission when the Arlington Bridge collapses, trapping the Martian Space Probe and its engineers in the river bed.
Jeff Tracy / Professor Wingrove / NTBS Reporter / Crane Chief (voice)
Lady Penelope Creighton-Ward (voice)
Scott Tracy (voice)
Virgil Tracy (voice)
Alan Tracy / Bill Craddock / 2nd NTBS Reporter (voice)
Gordon Tracy / Parker / Brains / Dave Clayton / Frank / Chuck / Policeman (voice)
John Tracy / Allington Bridge Controller / Kirby / Dr R. G. Korda (voice)
Tin-Tin Kyrano / Grandma Tracy (voice)
