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...

Alberto Nardi is a Roman businessman who fancies himself a man of great capabilities, but whose factory teeters perennially on the brink of catastrophe. Alberto is married to a rich and successful businesswoman from Milan, Elvira Almiraghi who has a no-nonsense attitude and barely tolerates the attempts of her husband to keep his factory afloat with her money.