Crazy Hand is a counterpart to Master Hand in the Super Smash Bros. series. Under the right conditions, it will appear alongside Master Hand as the final boss. Its moves are similar to Master Hand's, but impart different effects. Its movements also tend to be more erratic, lending to its name "Crazy Hand".
Notabley Crazy Hand does not appear in Super Smash Bros. Brawl's adventure mode, The Subspace Emissary.