As usual, the producers haven't bothered with a script, tossing this one out before production actually began. Like its predecessors, this effects-drunk sci-fi comedy is a mess. But it's a fun mess. Here, Will Smith's "Agent J" travels back in time to the 1960s to prevent an evil alien (Jemaine Clement from "The Flight of the Conchords") from assassinating a young "Agent K" (Josh Brolin). Josh Brolin's uncanny Tommy Lee Jones impression is worth the price of admission.103 minutes PG-13.