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 broken engine. With that done, they take off towards their home planet, taking the earthlings with them. However, the humans attempt to mutiny against their captors, inadvertently sending their tiny spaceship hurtling into the infinite beyond...
Leonora Ruffo
as Kaena
Mario Novelli
as Ingegner Paolo Bardi
Roland Lesaffre
as Prof. Solmi
Kirk Morris
as Belsy
Gordon Mitchell
as Murdu
Alfio Caltabiano
as Artie
Leontine May
as Luisa Solmi
Nando Angelini
as Ingegner Morelli
Giovanni De Angelis
as Giulio
Mirella Pamphili
as (credit only)
John Sun
as Dr. Chang
Antonio Ho
as Chinese Secret Agent
