Kingdom Hearts: Hoodlum Havoc

Kingdom Hearts: Sarah West and Jenny Williams' Hoodlum Havoc is a crossover video game based on the 2003 video game, 'Rayman 3: Hoodlum Havoc! 'it would have to be made by Square-Enix (for the Final Fantasy characters) and Ubisoft (for the Rayman characters)

plot
Sarah West and Jenny Williams are in a video game called "Rayman 3: Hoodlum Havoc". where Sarah West, Jenny Williams, and Rayman have to defeat Andre, the Hoodlums like Hoodbooms, Hoodstormers, Grim Keeper, Grim, Hoodblaster, Hoodoo, and Xowar, Begoniax, Razoff, Celoche, and Reflux!