Secrets from Ellis Grey's past come to light. Maggie makes a shock announcement and Callie continues to work on the Veteran's Project.
Kyle is distracted from his work by his new interest in philosophy. Meanwhile, Mike is upset that Boyd will be going to a bilingual school instead of one in his neighborhood.
Mike Warren, newly commissioned FBI agent, gets his first assignment living with 3 other agents from the FBI, DEA and US Customs.
While Raphael takes a turn leading the group, Leonardo ventures elsewhere and meets Karai, a female ninja with dark secrets.
Agent P quickly figures out there is more to Norm's odd reality show that celebrates the eventful life of his creator Dr. Doofenshmirtz, which is recreated through flashbacks and special guests.
The Turtles meet a devious inventor named Baxter Stockman. But is this man all that he appears to be?
Eric's going undercover for the first time to make sure that classified technology remains secure after a rocket engine expert ends up dead in a test chamber.
The penguins try to use Private's cuteness to their advantage. But Private gets fed up with everyone using him and decides not to use his cuteness anymore, even when he and the other penguins are about to be shipped to another zoo.moreless
Kowalski, Private and Rico decide to become superheros after reading a few comic books and their new personas might come in handy when they hear about a theif loose in the zoo.
Officer X becomes the substitute worker at the zoo while Alice goes on vacation and he is determened to get revenge on the penguins for all the misery they have caused him.