Sonic vs Mega Man is a franchise with includes a Super Smash Bros style game. It has the first appearence of Archie Characters. It so far has four games. Sonic vs Mega Man, Sonic vs Mega Man 2: The Dark Ages, Sonic vs Mega Man 3: Battle of the Multiverse,and Sonic vs Mega Man 4: Fate of the Multiverse. It is rumored to have a fifth game coming.
Characters(Compared to their Sonic/Mega Man "counter part")
First Appearence in Sonic vs Mega Man
Metal Sonic/Mega Man ?
Chaos0/ Yellow Devil
Super Sonic/Super Mega Man(Game)