Nearly 25 years after the original live-action movie, "Teenage Mutant Ninja Turtles" has been rebooted with digital 3D effects by explosion-loving producer Michael Bay, and the results are mixed. The reptilian fighters look bigger and meaner than ever, which darkens the tone of the pizza-loving jokesters from the cartoon show, but stays true to the old comics. Their creation story gets an intriguing twist, which helps to keep their familiar tale fresh, but they now appear to be bulletproof, diminishing the threats they face.

After TV news reporter April O'Neil (Megan Fox) stumbles upon the turtles, the humanity-helping heroes are forced out of the sewer when Shredder (Tohoru Masamune) and the Foot Clan threaten to unleash a chemical weapon on New York City. One chase sequence down a snowy mountain is eye-poppingly fun, but many of the fight sequences over-use slow motion effects to the point of annoyance.

As the first "TMNT" film with a PG-13 rating, it's not quite the parade of goofy one-liners that Gen-Xers remember, but neither is it an overly-serious adaptation in the vein of "Batman Begins." This splits the difference, leaving a blandly enjoyable romp that will still sell toys and spawn sequels.