King Boo is a character who appears as a minor antagonist in the Mario series. He is the leader of the Boos and the Ghosts. 

Luigi's MansionEdit

King Boo first appears in Luigi's Mansion, a game for the GameCube that features Boos and several species of Ghosts. He is the last boss to be defeated in the game. Defeating him will release Mario who was trapped in the game. King Boo later appears as a boss in other games such as [[Super Mario 64 DS]], Super Mario Sunshine, Mario Party 9, etc. 

Mario Kart seriesEdit

Despite being a boss that Mario and Luigi must sometimes face, King Boo has appeared as a playable character in various Mario Kart series such as Mario Kart: Double Dash!! and Mario Kart Wii. He has not appeared as a playable character since Mario Kart Wii.

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