Airing in 2014 on Cartoon Network, Over the Garden Wall follows brothers Greg and Wirt after they get lost in a bizarre forest called the Unknown. Over the course of the 10-episode series, the two boys meet an eccentric cast of characters, including a woman cursed to be a bluebird, sentient skeletons dressed as pumpkins, and a man so wealthy he didn't even know the size of his mansion. The woods are also haunted by a monster known as the Beast, who leads weary travelers to their doom to keep himself alive. That dark-fantasy setting appears to be entirely separate from Greg and Wirt's world, connecting these characters through some form of magic.
Source：https://www.cbr.com/over-the-garden-wall-theory-valid-maybe-incorrect/
