Although Marvel vs. Capcom 3: Fate of Two Worlds features a single player story mode in which you can play the Fate of Two Worlds storyline out in the role of each of the playable characters, the game is primarily a one-on-one crossover fighting game featuring heroes and villains from the Marvel Comics and Capcom video game universes. In this, action is team-based as players, either fighting against AI or a human opponent select three characters to stand against their opponent's three characters. Battles are essentially tag-team events, as at any time players can choose to switch characters as they look to string together combos that will do the most damage against opponents. All characters have special moves. In addition, special combos can be unleashed by each character after filling their power gauge while playing. Team combos can also be unleashed by switching between certain characters at specific times during fights.