Bowser Jr., known as Koopa Jr. (クッパＪｒ．Kuppa Junia) in Japan, or sometimes simply "Jr."[1] is a secondary antagonist in Nintendo's Mario franchise. As his name implies, he is the son of Bowser, and serves as the heir to his throne. He debuted in Super Mario Sunshine, and has since helped his father to kidnap Princess Peach and battle Mario and Luigi in many subsequent games. He has also taken on playable roles in spin-off titles such as Mario Superstar Baseball and Mario Strikers Charged. Bowser Jr. wants nothing more than to do his father's evil will, and Bowser's rarely seen emotional side is often brought out by his interactions with his son.