Uncle Grimly will only show himself after the black out, which is caused by lightning striking the mansion, causing the whole building to go dark. In order to light the mansion back up, Luigi must get into the Breaker Room, which is locked. Professor E. Gadd calls Luigi and tells him Uncle Grimmy has the key to the Breaker Room. Luigi must then go to the Wardrobe one, located in Area One to find Uncle Grimmly. When Uncle Grimmly sees Luigi, he attempts to scare him by screaming and wailing his arms. When he does this, he becomes vulnerable and with his heart exposed, Luigi can suck him up with the Poltergust 3000. After he is captured, Luigi receives the key to the Breaker Room.