The best argument for a sequel to Men in Black (1995) was Linda Fiorentino as the plucky morgue pathologist, but this new installment replaces her with Rosario Dawson, whose function is more decorative than comic. Will Smith and Tommy Lee Jones are back as Jay and Kay, government agents who monitor the high jinks of extraterrestrials on earth, and though director Barry Sonnenfeld (or somebody) has added a lot more beasties and other conceptual doodling (as well as product placements), the down-home satire of how we cope with cultural difference has evaporated, replaced by jazzy effects that wear out their welcome by the halfway mark. (The earth’s fate hanging in jeopardy near the end seems less urgent than whether Hope or Crosby will get Dorothy Lamour at the end of a Road comedy.) Michael Jackson has a cameo, Rip Torn and Tony Shalhoub reprise their original bits, and Lara Flynn Boyle as the head alien sprouts zillions of wormlike tentaclesbut a talking bulldog named Frank steals the show. 82 min. (JR)