In this animated adventure, International Rescue scientist and inventor Brains (David Graham) creates a high-tech airship, dubbed Skyship One, designed to circle the world. On its maiden launch, villains hijack the aircraft and a fierce gun fight breaks out, endangering a group of Brains' I.R. colleagues who are on board, including beautiful secret agent Lady Penelope (Sylvia Anderson). The Skyship is left in dire straits, forcing Brains himself to join the rescue attempt.