As an alternate storyline from Super Mario Galaxy, Princess Peach invites Mario to share some cake at the Star Festival, a time when Star Bits rain down from the skies over the Mushroom Kingdom. On his way, Mario finds a Luma, who immediately befriends him and grants him the ability to spin. Shortly thereafter, Mario's archnemesis Bowser, who has grown to an immense size (after swallowing Grand Stars, unbeknownst to Mario at this point), appears and attacks Princess Peach's Castle. Kidnapping the princess, Bowser escapes into outer space to recreate his empire at the center of the universe. After launching into outer space, Mario is given control of Starship Mario, a mobile planetoid in the shape of his head, made by a crafty Luma mechanic called Lubba, powered by Power Stars, and piloted by other Lumas; his mission is to fly across the universe in pursuit of Bowser and the Princess and to help Lubba find the lost Lumas that were part of Bowser's plot.