Luigi's Mansion is a location from the game with the same name. It was used as the heroes' headquarters in the first half of Season 4. Its appearance is based off its appearance in Brawl. It was destroyed by the villains at the midway point of Season 4, and the heroes abandoned the mansion as it was no longer safe.
- In the game, Luigi was scared of the eerieness of the mansion. However, in Super Smash Bros. Crossover, Luigi isn't afraid of it.
- Unlike the Xavier Institute, there is no security system and the Bakugan can't stand in the mansion without hurting their heads.
- It is unknown if the mansion had certain features of the Institute such as a link to the Supercomputer.