Jack parachutes to safety as the Areoglobe explodes, killing Zorn and other Grood henchmen and destroying the master death machine. REgaining consciousness, Vic Hardy demands that Grood sign a full confession of his guilt. Jack, Uncle Jim, Billy, and Betty enter the secret laboratory just as Grood overpowers Hardy. Grood escapes to a secret airfield where a plane is waiting. But Jack is right behind him. In the fight between Jack and Grood, the arch villain is blown to bits by the explosion of a hand grenade. Jack and his friends leave the now-peaceful island, the world no longer threatened with destruction. THE END. Imdb