King Boo

King Boo first appeared in Luigi's Mansion, as the final boss. King Boo kidnaps Mario, and it's up to Luigi to rescue Mario with the help of the Poltergust 3000, a vacuum he recieves that is use to suck up ghosts. King Boo also makes an appearance in Super Mario Sunshine and Mario Kart DS as a Mission Mode boss, and is a playable character in Mario Kart: Double Dash!! and Mario Superstar Baseball. Don't mistake him with Big Boo, wich is a bigger Boo, King Boo is the ruller of the Boos, Big Boos, and all other Boos.