Cartoon Network's MMO, FusionFall, is definitely a strong first entry into the market. With the Cartoon Network stars as the basis for their IP, and many industry names involved in the project, the hopes have been high. The story is set in a future version of Cartoon Network's own variant of Earth, where the characters are now teenagers - and a bit more anime-styled than their counterparts we know from TV. The premise is that Planet Fusion, a big nasty greenish planet-devouring ball of space-muck run by a terribad guy named Fuse, has come to snack on our beloved home. The only thing standing between Fuse, his sludge minions and the total annihilation of Future Earth is you - and the people playing in the world with you. Along the way Fuse is also spawning evil green versions of all the Cartoon Network characters to aid him in his sinister plan.
Now that you've got the general back-story, I've included the FusionFall opening cinematic behind the cut to set the mood before we move on. So far as opening cinematics for web-based games go, this one is definitely worth watching. From there, be sure to jump into the gallery for the full First Impressions on FusionFall.