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Cartoon Synopsis:

Brains has designed a revolutionary new automated airship, Skyship One, and Penelope, Alan and Tin-Tin will be aboard the craft on its maiden voyage around the world. Alan and Tin-Tin travel by Tiger Moth bi-plane to rendezvous with Lady Penelope and Parker in England and the quartet board the airship, unaware that the entire crew has been gunned down and replaced by imposters.

The bogus crew are in league with The Hood and have bugged every part of the ship that will be used by Penelope in order to record her voice. They plan to rearrange her words to create a false message which will lure Scott and Virgil in Thunderbirds 1 and 2 to a trap at a disused airfield...