S10E2
The Beginning of the End
⚠ Spoiler alert This recap gives away what happens in this episode.
Episode Summary & Review
While Raphael, Michelangelo, Donatello and Carter work on restoring Leonardo to his regular self, Mung steals all the plutonium from a power plant in order for Dregg to build a Plutonium Ray to turn Leonardo into a radioactive killer.