This Crossover Series takes place after the events of season 3 of Teenage Mutant Ninja Turtles 2012 where Karai/ Miwa returns to Splinter's side to become his true daughter. Things seem to be fine but until Donnie made a dimension portal that transported The Turtles, Splinter and Karai/Miwa to the Monster High Universe where they befriended by the Monster High characters and enroll at Monster High. In this new season of Teenage Mutant Ninja Turtles Donnie develop a crush on Gigi Grant, Raph becomes friends with Clawd, Mikey becomes friends with Heath and falls in love with Operetta and Frankie develop a crush on Leo and the Turtles, Splinter and Karai/ Miwa stay over at Frankie's house while they are staying this universe and Frankie's dad helps Donnie into making a way back to the Turtle's universe. But in this new season old enimies return and new ones come to life.

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