The Amazing World of Gumball: Season 1, Episode 25

1 - 25: The Poltergeist

Richard believes there's a ghost in the attic, but it is actually Mr. Robinson, who Gumball moved up there after he entered a catatonic state due to being kicked out by his wife. Gumball and Darwin work on trying to restore Mr. Robinson whilst Richard, unaware of this, sets traps for the ghost.