Here's a true slugfest for you: The entire movie is crawling with space slugs -- the kind that turn some people into people-eating slug men, others into acid-loogy-hawking zombies, and others still into giant globular slug-sows. Writer-director James Gunn honors his B-movie influences while managing to be truly original. Sci-fi star Nathan Fillion, who has the looks and sense of humor to be the next Bruce Campbell, plays a small-town police chief hunting for a man infected by a parasite from outer space. Once the chase begins, Slither starts running and never really stops. Character development is kept to a minimum, and the proceedings are too tongue-in-cheek to generate any actual shivers (just laughs and ewwws). But whether or not you'll like this movie comes down to taste: Either you've got worms in your heart or you don't.