- Seth Green (Leonardo (voice))
- Rob Paulsen (Donatello (voice))
- Sean Astin (Raphael (voice))
- Greg Cipes (Michelangelo (voice))
- Mae Whitman (April (voice))
- Josh Peck (Casey Jones (voice))
- Kelly Hu (Karai)
- Gwendoline Yeo (Shinigami)
Teenage Mutant Ninja Turtles — S2E4
Episode: Mutagen Man Unleashed
Air Date: 2013-11-09
Runtime: 22 min
Overview
Donatello experiments with mutagen in an attempt to find a cure for April's mutated father. But one of his expirements goes wrong and he is unleashed in the city.