Good Genes, Part 1

"Good Genes, Part 1" is the one hundred and second episode of the animated series Teenage Mutant Ninja Turtles (2003), which originally aired on April 1, 2006.

Major Characters

 * Donatello
 * Leonardo (Michael Sinterniklaas)
 * Michelangelo (Wayne Grayson)
 * Raphael (John Campbell)
 * Splinter (Darren Dunstan)
 * Karai
 * Agent Bishop (David Zen Mansley)
 * Leatherhead (Greg Carey)
 * Baxter Stockman (Scott Williams)
 * Foot Mystics

Voice-over introduction
Leatherhead : As we fly through the night, I can't help but ponder: intelligence, reason, even simple thought. Most people take these things for granted. I do not. For I know what it's like to be an advanced mind, trapped in the body of a brute... of a monster. But for once, I am not the monster in question. My friend Donatello is one of the gentlest souls I've ever met, with one of the finest minds I've ever known. But now, thanks to the evil agent Bishop, my friend has been transformed into a savage. And I fear that the Donatello I know may truly be lost forever.

Plot synopsis
The Turtles are in their lair, doing various things, but they can't get away from Donatello's struggling to get out of his cage. Leatherhead is looking at some samples of Donatello's DNA, and he concludes that Donatello's mutation from Agent Bishop's outbreak, along with his first mutation from the Utrom's Ooze, is causing his cells to degenerate. In short, he will eventually die. Tracing the outbreak back to Agent Bishop, they go to Area 51, and demand Bishop find a cure. Bishop, however, agrees only if the Turtles retrieve an important artifact from the Foot HQ - the Heart of Tengu. The Turtles, without other options to save Donatello, decide to do the deed.