Megalith

The Megalith are the unreleased looming threat across the Cartoon Network Universe. After they had led a failed invasion on the Earth, Project Exonaut was created to deal with them. The Megalith are not seen anywhere in the game, only mentioned in passing or commercials. However, the creators of the game claimed that they had plans for the Megalith. It is possible that the megalith is referencing Planet Fusion, and the game is set after FusionFall. This is not confirmed, however. This content ended up not being added to the game.