Two generic men and two generic women land on a planet that appears to have an Earth-like ecosystem on it, except that the crocodiles and iguanas and stuff are gargantuan and have weird backscreened fights with each other while the humans -- supposedly scientists on a research mission -- spend their time shooting anything that moves, whether it threatens them or not, and finally nuking the place just because. In a genre full of duds, this is one of the worst.