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Some TMNT stuff really isn't for little kids. |
Jonathan Crane was a brilliant psychologist who began experimenting with a "Fear Toxin" he developed, and became the criminal Scarecrow.
He was among the inmates at Arkham Asylum who was mutated by Shredder and Ra's al Ghul, using mutagen obtained from another dimension. He was transformed into a massive crow with a burlap mask. During the final battle, he fought first Raphael and then Splinter, and was defeated.
It was later confirmed that he would revert back to normal in a week's time.