Worlds United: Super Smash Bros. x Kingdom Hearts

Kingdom Smash Bros. Brawl: Friendship for the Future is a Japanese-American action role-playing game that is distributed by Nintendo, Sega, Capcom, Bandai-Namco Games, Activision, Konami, UbiSoft, Rockstar Games, Disney and Square-Enix. This game includes characters from both Kingdom Hearts and Super Smash Bros.

Plot
The battle is over, Xemnas has been defeated, but a new evil enemy has risen, and it threatens to destroy all of the worlds that the future will bring, now it's up to every Super Smash Bros Fighter and the Kingdom Hearts keybladers to save everything that was good from becoming bad.

Gameplay
you can play as a Super Smash Bros. fighter, and a keyblade wielder you created or the main ones from the previous installments in the franchise.

Worlds/Dimensions
you can travel to most of the worlds from Nintendo, Sega, Capcom, Bandai-Namco, Activision, Konami, UbiSoft, Rockstar Games, Disney, and Square-Enix.