After re-energizing the present-day Turtles, the Turtles of the past have only 3 hours to get back to their time, or they will all cease to exist. Meanwhile, during the 15 hours it took to re-energize the Turtles, the remainder of Dregg's invasion fleet has been completed and has been unleashed on the city and now the Turtles and Carter have to stop Dregg, Krang, and Shredder. In the end Shredder and Krang are sent back to Dimension X, and after sending the past turtles back to their time, Landor and Merrick give Carter an offer to come with them to their time in the future to receive medical treatment that will completely cure him of his mutation. Carter accepts and he and the turtles say their goodbyes before he teleports away.
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