Turtles Forever (2009)

In the heart of Turtle City, an unusual phenomenon unfolds: delving into the mystery during an investigation at a Purple Dragons' base, Leonardo, Donatello, Raphael, and Michelangelo stumble upon unexpected counterparts – none other than their '87 series selves! With this unexpected reunion comes the realization that their arch-nemesis, Shredder, is likely lurking nearby. Now, the eight turtles must join forces to confront both the familiar and the unknown. Brace yourselves for a thrilling tale that marks 25 years of the TMNT legacy!