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Some TMNT stuff really isn't for little kids.
Slimer is a character from the Ghostbusters franchise. He appears in the Cartoon All-Stars To The Rescue And Run With Us crossover. Slimer was voiced in the crossover by Frank Welker who also voiced him in The Real Ghostbusters. Billy West took over the role in the cartoon Extreme Ghostbusters.
He briefly appeared in the Teenage Mutant Ninja Turtles/Ghostbusters comic mini-series, in which Michelangelo mistook him for a lava lamp and was frightened when Slimer lunged at him.