Mario & Luigi: Superstar Saga, known in Japan as Mario & Luigi RPG (マリオ＆ルイージRPG?), is a role-playing game developed by AlphaDream and published by Nintendo for the Game Boy Advance in 2003. Superstar Saga is the first game in the Mario and Luigi RPG series and was followed by two sequels, Mario & Luigi: Partners in Time, which was released for the Nintendo DS in 2005 and Mario & Luigi: Bowser's Inside Story, which was released in 2009, also for the DS.
The game begins in Mushroom Kingdom, but changes to Beanbean Kingdom for the majority of the game as Mario and Luigi combat Cackletta, the central antagonist of the game. The quest begins when Cackletta, with the aid of her assistant Fawful, steals Princess Peach's voice after adopting the guise of an ambassador from Beanbean Kingdom.
A role-playing game, it centers on a battle system different from that of traditional games of the genre, with emphasis on timing and more elaborate attacks. The game is whimsical in tone, with various in-game jokes and comical references to the heritage of the Mario series. Superstar Saga was generally well received by critics, and IGN named it the twelfth best Game Boy Advance game of all time in their feature reflecting on the Game Boy Advance's lifespan.