The Super Mario Galaxy Movie

Princess Rosalina, the adoptive mother of the Lumas living in the Comet Observatory, is kidnapped by Bowser Jr., who plots to drain her powers to fuel a universe-destroying cannon in honor of his father, Bowser, who was defeated by Mario and Luigi and shrunken by Princess Peach. Meanwhile, Mario and Luigi are called to inspect a disturbance in the Tostarena Town, where they discover and befriend the dinosaur Yoshi, who had hatched in Brooklyn and was pursued back to his home world after accidentally breaking a dinosaur skeleton in a museum. A Luma sent by Rosalina arrives in the Mushroom Kingdom, where it enlists Peach and Toad for help. In Peach and Toad's absence, Mario, Luigi, and Yoshi protect the Mushroom Kingdom and attempt to rehabilitate Bowser.

Bowser Jr. lifts Peach's castle into space in an attempt to free his father, but a battle with the brothers and Yoshi causes his spaceship to drop the castle into the Honeyhive Galaxy. Bowser goads Mario into attacking him, thus unshrinking him, but kindly offers to be arrested for damaging the fields in exchange for the brothers and Yoshi getting transported to the Gateway Galaxy. Bowser later gets abducted by his son, whom he had not seen in years. In the Gateway Galaxy, Toad's backpack is stolen by monkey thief Ukiki, who takes it to a hidden casino. Peach meets Wart, the casino's owner. Peach forces him to reveal Rosalina's location, the Space Junk Galaxy, but he then alerts the Bowsers about Peach.

Mario, Luigi, and Yoshi reunite with Peach and Toad, who have hired pilot Fox McCloud to transport the group. Fox's Arwing crash-lands into Fossil Falls after an attack from Bowser Jr., who transforms Mario and Luigi into babies with a Super Scope. Bowser expresses regret over double-crossing the brothers but returns to his old ways to mend his relationship with his son. Yoshi finds the Super Scope, rescues the brothers from a Tyrannosaurus, and restores their ages. Luigi alerts the Lumas, who pick them up in the Comet Observatory. It is there that Peach learns that she has the same powers as Rosalina, her long-lost older sister. When they touch hands, they can summon the power of the cosmos. She and Rosalina were born from stardust, and Rosalina sent an infant Peach to the Mushroom Kingdom to protect her from an unidentified attacker.

Fox, Toad, and the Lumas pilot the Comet Observatory to send the other four to the newly-made Planet Bowser. Mario and Peach confront Bowser on a bridge; Mario drops Bowser into the lava moat below, but the latter survives in a skeletal form. Luigi and Yoshi assist Mario in defeating the Bowsers with power-ups. Peach revives a dying Rosalina and they transform Planet Bowser into a new world. Mario, Luigi, and Yoshi help the sisters, Toads, and Lumas rebuild Peach's castle. Fox sends the Bowsers to prison before heading home to his universe. Back at the Gateway Galaxy, Princess Daisy prevents Ukiki from committing another robbery.