A survey mission to Titan ends in disaster after something has wiped out the crew. Two new missions from rival countries head out to find out what has gone wrong. The US mission led by Davison (Stan Ivar) soon runs into trouble when it gets stuck on the surface.
They head over to the German ship which has already arrived but finds that the crew is dead apart from it's commander (Klaus Kinski). He tells them that they found ancient alien infrastructure, and now a dangerous alien is running amok...
So, the plot will be pretty familiar and predictable and the effects are mostly cheap (though the alien itself is pretty excellent). This is an enjoyable sci-fi romp that has enough nonsense, twists and gore (and no shortage of cheese) to keep you entertained.