Super Mario Space Odyssey

"Let's-a go...into outer space! Play as Mario, Luigi, Peach, Toad, Rosalina, their new friend Cosmai, and even Bowser and Bowser Jr. as you journey across over a hundred different worlds to stop evil aliens from conquering the Mushroom Kingdom! Run, jump, bounce off walls, ride motorcycles, race in karts, pilot spaceships, throw fire, control water, shake the earth, manipulate the air and so much more!" "- Release tagline"Super Mario Space Odyssey is a Super Mario 3D platformer game concept by Red-Verse-Writer. Despite the similar title, it is not a sequel or spin-off to Super Mario Odyssey, and is instead a completely different game with similarities to Super Mario Galaxy and Super Mario 3D World. The game revolves around Mario and his friends as they travel across 114 different planets to combat the Nukteks, an evil alien empire that is enslaving entire species and has targeted the Mushroom Kingdom.

Plot
During a picnic out in the Mushroom Kingdom hills, Mario, Luigi, Peach and Toad see a meteorite entering the atmosphere and watch it crash nearby. When they go to investigate, they discover that it is not a meteorite, but actually a spaceship that has been too badly damaged to retain flight. They enter it and come across the pilot, a alien named Cosmai, who tells them that her home planet has been taken over by the evil Nukteks. Mario and Luigi use a radio tower on top of Peach's castle to call Rosalina, who arrives in the Comet Observatory and picks them up as the six head off to try and free Cosmai's home from the Nukteks. Unbeknownst to them, Bowser and Bowser Jr. have stowed away on the observatory, interested in what seems to be so "exciting".

After reaching outer space, the Comet Observatory begins its trip towards Cosmai's home planet.