Baby Luigi is Baby Mario's brother. He had to be rescued in Super Mario World 2: Yoshi's Island, and appeared in Mario Kart: Double Dash, and Mario & Luigi: partners in Time. Mario Kart: Double Dash!! is a video game developed and published by Nintendo for the GameCube video game console. ...
In the introductory sequence, Baby Mario and BabyLuigi are on their way to a playdate with Baby Peach when they come upon Baby Bowser trying to kidnap the princess.
Baby Bowser is planning on returning to his castle for a snack, but baby Princess Peach's crying forces him to shoot a spiked ball to flatten the Shroobs menacing Mario and Luigi.
Charles Martinet as Mario, Luigi, Baby Mario, BabyLuigi.
Luigi's name was inspired by a pizza parlor near Nintendo of America's headquarters in Redmond, Washington, called Mario and Luigi's.
Luigi is now generally accepted as the younger (yet taller) brother of Mario, though in the game Super Mario World 2: Yoshi's Island, he was said to be his twin brother.
Luigi played quite a different role in the Super Mario Bros. movie, where he was portrayed by John Leguizamo.