Mykelti Williamson and Justin Lazard are a pair of astronauts who make the first successful manned mission to Mars. Lazard's character gets infected by an alien and slowly begins to mutate. When they get back to Earth all he has on his mind is to have sex with Henstridge!—Anonymous
Natasha Henstridge, Michael Madsen, Marg Helgenberger
IMDB plot
An astronaut gets infected with alien DNA during the first mission on Mars and runs amok on earth. Preston and Laura team up with a peaceful, genetically re-engineered Sil to track the monster down.