Board Thread:General Discussion/@comment-11469381-20140408005123/@comment-24204226-20140414145232

That was a creepy episode, but in the 2003 series he never got mutated. He may have been taken apart and put back together in a strange form, courtesy of Bishop, but he never mutated. He was mutated in the 1987 series at the hands of Krang and Shredder so I think this would be a nod to that.