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Leonardo is the leader of the Teenage Mutant Ninja Turtles, the closest to his Master Splinter, close friend of IG-86 and Numbuh 1, and one of the main characters of the IG-88's Adventures Series. He is voiced by Seth Green.


  • From Seasons 1 to 2 of the 2012 series, Jason Biggs of American Pie fame voiced Leonardo.