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Well Donatello's Degree came out in 1990. So that makes sense I guess. They mentioned the date in "Once Upon a Time Machine" (Don: "Next stop, the year 1991") and "Elementary, My Dear Turtle" (Don: "Don't look now guys, but I think we're in the wrong 1991")
I can't remember if there were any others.
I think the "pattern" lasted from 1990 to 1992. I don't think 1993 had as many crazy psycho human villian episodes.
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