Like Freddy vs. Jason or Godzilla vs. Mechagodzilla, the showdown between Alien (face-hugging, vagina-dentata mawed) and Predator (dreadlocked, vagina-dentata mawed) is both trashy and inexplicable. Don’t expect illumination on the grudge between these two. Instead, expect a brisk, gooey bit of schlock that’s a million times better than 2004’s action-lite AVP. The money shot? A pregnant woman’s belly explodes, revealing a litter of baby aliens. Aliens vs. Predator: Requiem is a B movie that truly earns its B.