Showdown Part 1 & Part 2. Showdown Part 1: After learning that the Kraang are planning an invasion, The Turtles engage in a difficult battle as they make a desperate assault on TCRI to shut down the Kraang's portal before it summons the Technodrome, and in order to save April whom the Kraang managed to capture with the help of Shredder. They destroy TCRI, but not before the Technodrome comes through the portal. Showdown Part 2: The Turtles must infiltrate the Technodrome in order to save April. Meanwhile, Splinter faces off against Shredder after defeating Dogpound and Fishface. When Splinter recognizes Karai as his own now-teenage daughter, Miwa, (whom Shredder had told that Hamato Yoshi was the ruthless murderer of her mother Tang Shen), he retreats in sorrow; unable to fight against his own child. Back at the Technodrome, the Turtles must get through Kraang Prime to get to April before Kraang Prime can use her inherent mental abilities in order effectively trans-mutate the human race into fellow Kraang.