Neville Savage's search for a sunken Spanish galleon off the island of Mallorca attracts the attention of the Centauri Network when his sonar tests drivers all the fish from the bay.
Before returning to Australian, Sir Joshua, Albert and Vicki stop in Yorkshire England to visit his aunt Edith who is having trouble with her neighbour.
Sir Joshua, Albert and Vicki return triumphantly to the farm in Australia knowing that although Savage remains at large, all of his accomplices have been arrested.
After escaping from prison, criminal mastermind Neville Savage breaks into the Tower of London and steals the Crown Jewels. The children of the Centauri Network are too late to stop him as he escapes in a submarine to Ireland.
In a castle in Spain, Neville Savage has managed to get hold of Sir Joshua's latest invention, the Duplivox Mark VII, a device which allows one to perfectly transfer the voice of one person to another.
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Top Gap
By what name was Mission Top Secret (1993) officially released in India in English?