Old foes die hard when a portal glitch brings the modern-day Ninja Turtles mask-to-mask not just with their goofy earlier incarnations but with archenemy Shredder and his counterpart Ch'rell, who plot to eliminate two sets of Turtles with one stone. The transdimensional travel miles add up as the baddies head to the Prime Universe, while Turtles old and new marshal swords, skills and the Party Wagon to overtake them.