Once Upon a Time Machine is the second Easter episode of the 1987 Teenage Mutant Ninja Turtles Cartoon. It originally aired over CBS aired on 29 March 1991. While not so Easter-themed as The Turtles and the Hare, it features the Easter Bunny Hokum Hare from "The Turtles and the Hare" assisting the turtles in preventing Shredder to time travel into the future and rule it.[1]