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Clarke is also famous for his work outside of Blizzard where he provided the voices for Leonardo and Rock Steady in Teenage Mutant Ninja Turtles. He has voiced many other roles in video games including several characters in Neverwinter Nights, the character Jack in Robotech: Battlecry, and the character Liquid Snake in Metal Gear Solid from the Metal Gear series. Additionally, he has voiced roles in several North American dubs of anime including Max Sterling and Lancer in Robotech and Kaneda in Akira.