The actors responsible for all of the turtles' voices have cameos in the movie except for Raphael's. See more...
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Revealing: During the fight sequence between the Turtles and the foot soldiers in the TGRI lab, Michaelangelo has the Ooze when two foot soldiers somersault into view to surround our groovy hero. Watch the foot soldier flipping into the shot in the background. You can see the crash pad he's landing on to help protect the actor.