More turtles, more ninjas, and more Megan Fox, all packed in the new trailer for this summer's Teenage Mutant Ninja Turtles movie. Oh, and more Shredder. Master Shredder, voiced by William Fichtner, narrates the trailer telling reporter April O'Neil, played by Fox, that heroes are not born, but created. And that's exactly what Shredder is up to with our best look yet at the four masked pizza grubbing shelled heroes in action in true cowabunga fashion. Will Arnett, Whoopi Goldberg, Noel Fisher, Johnny Knoxville and Jeremy Howard also star in the August 8th flick from Paramount Pictures and Nickelodeon Movies. Continue after the jump to see the full trailer and make sure to mark your calendars.