A rocket sent to Mars that though to be lost returns. so they want to grab it and bring it home. They manage to bring it back with remote control. They soon find out there are two people alive inside. one has a green goo on his hand and the girl is fine. under hypnosis the girl tells quite a story. as they fly to mars they are warned by a radioactive meteor not to approach but they just avoid it. after quite some time of flying and other random conversation that is no way in relation to the movie they finally land and go into taking some tests.
Eventually they go on exploring and researches the plantlife in there. wait, plantlife? apparently there are no chlorophyll but a lot of nervous systems in plans. they also get attacked by some man-eating plan that they cut to pieces. then they kill it with high-pitch sound gun. god that sound is annoying. The next day they are attacked by a giant spider-bat hybrid monster. they once again use the weapon to attack it and scares it. so they go after him "exploring". and they find a LAKE.
Once they are back to the rocket they decide to leave the planet and fly back to earth and report everything. But they cant leave, some sort of forcefield is keeling them on the planet. They find out its a gravitational field. so they decides to go across the lake they found to search for answers. seriously, this is the best they came up with? They find a cartoon-city. well at least thats the "special effect". it seems to be highly advanced civilization city in the middle of the lake. However a monster emerges that does not allow them to get to the city. he seems hungry too. it seems to devour everything it touches. its a Giant amoeba. They kill it with ultra sound then the aliens contact them and give them a warning, but the girl fades thus hypnosis cant tell what she heard further (which is incorrect because fainted people can still hear, though not recall it). When she wakes up she sees one of the scientists dieing. That is all she remembers and then they come back to earth. the aemeba on the guys hand is growing and scientists are unable to do anything about it. They then find a tape with aliens warning warning them not to land on Mars.
Story: 4/10. Not completely good, but not that bad.
Acting: 4/10. fine for a b-movie. but thats it.
Sound: 6/10. surprisingly nice.
Sci factor: 6/10. even though this may sound wierd, the monsters were awesome and the basis for the amoeba nad the cure i found sweet.
Lasting Appeal: 6/10. wont be forgetting the all swallowing amoeba any time soon.
Overall rating: 5/10.