We then cut to the "launching platform" where American guy and an English guy are having a meeting. It all looks very 1950's with both men wearing suits and the English guy smoking a pipe. The English guy's secretary takes a memo. English guy says that they'll be ready to launch within a week. Both men then perv over the secretary as she walks back up the stairs. English guy says "I wonder if the beings on Jupiter's satellite will look anything like her" and both men laugh at his amazing wit. Oh yeah, they're going to the 13th moon of Jupiter for some reason, which incidentally wasn't discovered until 1974, but whatever.
Eventually they arrive at the 13th moon of Jupiter. They hear a voice over the radio. It's a man's voice saying that the ship is now under his "space control" which is WAY better than just being under his non-space control, obviously. After yet more lever pulling the guys land on the moon. They all then light up and have a congratulatory cigarette. The professor guy onboard discovers that the atmosphere of the moon is identical to that of the earth. What a stroke of luck! It's just as well really, as they don't appear to have brought any space suits. So they venture outside in no more than short-sleeve shirts and trousers, but fortunately it's a lovely day outside. It looks just like the English countryside. Okay, it is the English countryside. But we're supposed to believe that this is the 13th moon of Jupiter, so we'll just go with it for now.
They go for a wander and encounter a young woman being attacked by a "monster". The monster is just a guy in a body stocking and a melted gorilla mask going "Raar!". No, honestly. The guys fire their guns and scare the monster away. The woman then beckons to the guys to follow her, which they obviously do. The woman disappears behind some sort of secret door. American guy and the captain follow her, instructing the other three guys to wait outside. They're told to return to the ship if American guy and the captain haven't returned in 30 minutes.
So the American and the captain follow the girl. They end up in a palace with an old git. The old git tells them that he is the leader of "New Atlantis". He explains that when Atlantis was flooded the Atlantians bogged off into outer space and made a new home on Jupiter's moon. Now call me unadventurous and a little bit cautious if you like, but surely they could've just moved to higher ground on the earth? Fucking off into space because it rains a bit does seem a little extreme to me. Anyway, the old git goes on to say that he is the lone male survivor of Atlantis. He says that our friends must remain on the moon until they have destroyed the monster. The old git says that the woman they saved from the monster now belongs to American guy. "It's the law of Atlantis" apparently. Then a load more young women appear and give the guys booze. While the men drink, the women perform a "dance" that looks like the sort of dance a deer would do after it had been wounded by a shotgun. This dancing goes on for an agonisingly long time while the guys get more and more pissed. In fact it turns out the guys have been drugged. Meanwhile the other three guys return to the ship when the other two fail to make an appearance.
American guy comes around to find himself in a room on a bed. His newly acquired wife is there. She explains that the old git is in fact holding all the girls prisoner there. None of them can leave. American guy says he'll help her escape. Meanwhile the three guys on the ship decide to come looking for the other two. American guy's girl manages to drug the old git, but she's then captured by the other girls who say she will be sacrificed to their "Sun God". American guy's girl lies on an altar with a fire behind her, while in the foreground there is yet more terrible dancing by the other girls. The other three guys are also here as they were somehow captured and tied up. The old git comes to and staggers about a bit outside before being killed by the monster. American guy and the captain both manage to escape from their rooms. The monster comes into the room where the ritual and dancing is taking place. He growls again "Raar!" and all the girls run away screaming. The monster stands behind the altar. American guy throws a gas grenade at the monster and he falls back into the fire and dies. Although he may just be having a nice snooze, as we see the corner of the mattress he falls back onto poking out from behind the altar.
American guy rescues his girl from the altar and the other three guys are untied. American guy announces to the girls that the old git is dead. The girls proclaim American guy's girl to be their new leader. She says she's going to earth with American guy but will return soon, so she makes one of the other girls temporary leader. She says the girls can live in peace now that the old git and the monster are both dead. One of the girls says that the old git promised them husbands. American guy says she need not worry, as further expeditions will return. The girls wave goodbye to the rocket as it takes off and we hear that bloody awful music from the start again. The end.
I'm not sure I can convey in words just how dire this film is but I'll try. This film is a pile of wank. To call this a film I fear is giving it too much credit. If you were to gorge yourself on all the crappy sci-fi films ever, your resulting vomit would probably look like this. I could make a more engaging, realistic, thrilling and tense film than this using my phone and a couple of sock puppets. What were they even thinking? Did they have literally no money to make this? Because that's what it looks like. I saw the IMDb rating of 2 out of 10 before I watched this, and I thought there's no way it could be that bad. Boy was I wrong. In fact I'm not quite sure how the rating is that high. Maybe some people gave it a sympathy vote.
Needless to say there is no science in this film whatsoever. The interior of the rocket is just a room and the "moon" is the English countryside. Even the editing is pants. In some scenes we hear just the first half a second of a woman screaming and then the film is cut to another scene. The acting is awful and I'm not sure there was a script, I think they just made it up as they went along. The visuals, effects, music, script, story, acting, editing and anything else you can think of are all terrible. The only good thing about this film is the poster art, which WAY over sells it. It's not even a "so bad it's good" film. It's just bad. Please, for the love of God, I implore you, don't watch this.