Sonic, Bumblebee, Ruby, and Tanjiro, all in their worlds, all have a similar dream where they meet Rosalina. Rosalina asks them to come to Mario's World in the Mushroom Kingdom because the very evil from their worlds have forcibly came to their worlds. What they don't know is how their sworn enemies got there. After a chance meeting with Mario, the heroes and their allies band together to face an incoming threat that could end the Mushroom Kingdom and other worlds. Super Mario (C) Nintendo Sonic the Hedgehog (C) SEGA Transformers (C) Hasbro RWBY (C) Rooster Teeth Demon Slayer (C) Shuiesha
7 parts