The Spirit Plane is the foggy home of the spirits, where the Deer lives and where the turtles went to train before returning to New York.
There, the turtles defeated spiritual aparitions of their enemies: Rahzar, Tiger Claw, Fishface, Foot Soldiers and Shredder.
The spirit plane woods appear in the Season 3's new opening sequence, as the Turtles appear in their Vision Quest suits.
Trivia
- The Spirit Plane is similar to the Astral Plane featured in the Mirage and Image comics.