Aliens from the constellation Hydra crash-land on the island of Sardinia. A prominent scientist, his daughter, several young technicians, and a pair of Oriental spies are taken hostage by the beings so they can use them to repair their spaceship's … Leonora Ruffo, Mario Novelli, Roland Lesaffre, Kirk Morris, Gordon Mitchell, Alfio Caltabiano, Leontine May Added on Amazon Prime 2022-12-01.