Mario And Sonic: Space Adventure

Mario And Sonic: Space Adventures is based off both Super Mario Galaxies, as well as Sonic Colors. The mixture leads to things such as Sonic riding a light blue Yoshi and Mario turning into a black hole.

Plot
Mario and Sonic are roaming around Planet Wisp, having the time of their lives, when a group of strange asteroids are about to hit the planet. Sonic, baffled by the sudden predicament, prepares to save the Wisps from disaster. Mario tells Sonic that the asteroids are miniature galaxies, though admits he has no idea why it would be here. Then, an Egg Robo, along with Bowser Jr, can be seen on one of the planets. However, Planet Wisp suddenly starts orbiting the still-lowering galaxies! Mario and Sonic decide to team up in order to keep the galaxies at bay.