Giant in the Fairytale Dimension
The Fairytale Dimension is a reality where fairytales are true. It appears in the episode The Turtles and the Hare of the 1987-1996 animated TV series, where Leonardo and Raphael go there to find the Cyranium crystal as an antidote for Krang's Docilizer Ray.
They encounter Hokum Hare, who follows Leonardo and Raphael to Earth. Hokum Hare is sent back to his own reality at the end of Once Upon a Time Machine.