Incredible Shrinking Serling Teenage Mutant Ninja Turtles : Season 7 Episode 6

Serling, desperate to return to his own time, builds a makeshift Time Window. Unfortunately, he accidentally shrinks himself to five inches tall and goes on a time traveling adventure. Unfortunately, when he escapes the clutches of arguing Turtles, he is found by Wendell, an old man who has been hunting him since Serling destroyed his toy eighty years previously and wants to reproduce him.