Krang and Shredder decide to use Ireland as their base for the Technodrome. With a device called the Rainbow Trans-Charmer, the villains intend to turn harmless little creatures like sheep and rabbits into slavering beasts. The Turtles and Splinter, vacationing in Ireland, are attacked by the monster-sheep and track Shredder, Bebop and Rocksteady to the Dublin Zoo, where they are transforming the animals.