Galactus is the ridiculously overpowered final boss of Marvel vs Capcom 3. For its Ultimate version, Capcom has announced that the boss will be a playable character at a panel at New York Comic Con.
No, you won't be able to play with him in a standard match. Instead, he'll be relegated to his "own little mode" where you can pick on the various Marvel and Capcom heroes. Sometimes, you need to vent by wrecking havoc on the good guys, right?