Omega Crisis

Omega Crisis is a crossover fighting video game developed by Eighting and published by Smile Games. It features characters from Smile Games, Sega, and Cartoon Network.

Gameplay
The gameplay is a mixture of Tekken and Super Smash Bros.; characters fight in 3D arena while trying to knock opponents off the arena. Every character has a "Omega Super" which builds up during the fight and acts similar to a Final Smash from Super Smash Bros.

Plot
Worlds of Smile Games, Sega and Cartoon Network are brought together by an malevolent entity known as Crex and seeks to take all of them over. It is up to the heroes of the respective worlds to stop Crex.