This takes place after season three, episode 11, The Pig and The Rhino, so Karai is in Shredder's "care."

Chapter 1: The Order

Shredder gazed into the cage, watching as Karai threw herself at the glass, hissing and crying out in anger. His own rage built at her predicament. If only she would have listened to him and stayed by his side, none of this would have happened. If only Yoshi would stay dead and those turtles dead as well, then Karai could stay by his side.

"Master Shredder," Tiger Claw called out. Shredder nodded, acknowledging his faithful servant's presence. "I have brought the two you have requested." A mutant rhino and warthog stood close by, a large skeletal wolf watched them carefully, and making sure they would not leave.

"Zeck, Steranko, tell me, what did you hear the turtles say," Shredder ordered, turning away from his daughter.

Zeck glanced down, nervous, "The orange talked about how not to break someone's retromutagen."

"Retromutagen?"

"Yes," Steranko added. "It could turn us human again." Zeck nodded, hoping that they would be able to get some.

Shredder hummed a bit, thinking before saying, "Do you know who made it?"

Steranko and Zeck looked at each other, hoping one of them had the answer before Steranko lifted a finger and said, "Yes. He is the smart one, the one in purple."

"Donatello." Shredder grew silent for a moment before starting to laugh. "To think, his own son could bring his downfall. Bring him to me. Alive. Let us see how smart he really is."

Author's Note: Yeah, I know, super short, but I felt we needed to see some bad guy action. Donnie is in for it.