The Rainbow Trans-Charmer
is a device invented by Krang that produces a powerful ray that will turn harmless creatures like sheep and rabbits into slavering beasts, and conversely will turn fearsome animals into tiny, mild-mannered creatures. Shredder used it in the Irish city of Dublin in an effort to drive human beings off of the island,

The ray also affects mutants as well as animals, making Bebop and Rocksteady small and childlike, but causing Michelangelo to grow and become more aggressive.

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