A starship captain is sent on a mission to a distant planet to find a rare element called Antalium. He is accompanied by a team that includes a disproportionately high number of sexy women. When there they encounter Onaph, the planet's overlord, and his servants, all of whom resemble Brian Jones from the Rolling Stones. It seems that the planets true ruler though is a giant ancient computer.
But mostly it's about people having sex.
The Beast in Space is directed by Alfonso Brescia who seems to have been a bit of a specialist in cheap Star Wars clones, such as War of the Robots (of which I am sure it shares some footage, specifically the scenes of the Brian Joneses fighting with laser swords). This one is another in this genre, except it is a porn version. George Lucas certainly never went here before. It stars vixen Sirpa Lane, who also starred in Joe D'Amato's ultra-trashy Love Goddess of the Cannibals. This one is quite good fun for the most part but it does do that thing that most of these sexploitation films from the era do and that is that it features seemingly endless soft-core fumbles that get tedious quite quick. Bizarrely, you actually want more of the actual plot. Having said all that, this one really goes into hyper-drive with the scene where Onaph reveals himself to be a space-satyr with an enormous erect penis. He then engages in an animalistic sex scene with Shirpa Lane. It's certainly memorable and it's what ultimately sets the film apart from others of its genre.