Super Mario Galaxy

Super Mario Galaxy was Mario's adventure in space to rescue Peach, who has been captured by Bowser and held at the center of the universe.

History
The centenary Star Festival was happening in the Mushroom Kingdom and Peach had invited Mario to show him something. Mario arrived in Toad Town, but the festival got invaded by Bowser and his forces. A giant spaceship emerged to pull Peach's Castle out from under the ground, while Mario was shot away to places unknown.

Mario is awakened on a small planetoid where he is introduced to Rosalina who tells him his mission of recovering her Comet Observatory's Power Stars, which were stolen by Bowser during his invasion. If Mario were to collect enough Star Energy, Rosalina would be able to steer the Comet Observatory to Peach's location. Mario then traveled to different Galaxies and retrieved enough Power Stars to reach Bowser's Galaxy Reactor; located at the center of the universe.

Mario defeated Bowser right at the core of his galaxy's sun and recovered Peach. Unfortunately, Bowser's sun explodes, accidentally causing a supernova which created a massive black hole that destroyed the entire universe. All of the Lumas then joined together to create an emergency reset of the universe.

Mario wakes up in front of Toad Town and, hearing Rosalina's parting words, happily welcomes his new universe.

Timeline

 * This game begins during the Star Festival, a special event held for one night every 100 years in the Mushroom Kingdom.
 * Mario meets Rosalina, for the first time, placing this game before all other games featuring Rosalina.
 * The Toad Brigade forms for the first time here, introducing Mario to Captain Toad.
 * Bowser has new alliances with alien races, such as the Octoombas and Mandibugs.
 * Bowser Jr. appears, placing this game after the events of Super Mario Sunshine.
 * Bowser accidentally causes a universe-destroying black hole at the end of this game, but the Lumas cause the universe to reset.