Episode Title:The Alien Agenda.Episode Description:Leo and Raph fight over whether or not they can trust Karai. The Turtles get their first look at high school when April's school project draws attention from the Kraang. Karai learns about the existence of the Kraang and tries to tell Shredder, but he is uninterested. Karai then follows the turtles into a Kraang research facility, where she is found by Raph, which ultimately leads to a battle between the Kraang and the Turtles.