I don’t remember TMNT ever being on Nickelodeon. What I remember was them being on during after school cartoons on the regular antenna stations, and sometimes in the mornings during the summer. I think they had a Saturday morning run for a bit too.

“‘Money doesn’t buy happiness.’ Do you live in America?..because it buys a WaveRunner. You ever see a sad person on a WaveRunner?” -Daniel Tosh