Two interstellar spacecrafts, the Argos and the Galliot, receive a distress call from a desolate planet named Aura. The Argos, piloted by the stoic Captain Mark Markary, attempts to land on Aura after abruptly losing contact with the Galliot, thought to have been pulled into the planet’s atmosphere. Things take a turn for the bizarre as the members of the crew suffer from a strange convulsion that prompts them to attack one another. The Captain’s acuteness temporarily prevents any bloodshed, but the crew is left agitated in regards to the strange power that overtook them, suspecting it to be behind the disconnection leading to the Galliot’s disappearance. What follows is a series of perplexing finds as the crew of the Argos quickly discovers the fate of their fellow space travellers as well as the source of their recurring bouts of "space madness". Mario Bava, better known for his garish horror films and gialli, makes this hallucinatory foray into science fiction a memorably hypnotic showing.