Marvel Entertainment and Gazillion Entertainment launched Super Hero Squad Online, Marvel's first free-to-play massively multiplayer online game.

Players can build their squad from dozens of available Marvel Super Heroes, including Thor, the Scarlet Witch and Electra, to save Super Hero City. Fans can play the game entirely for free or subscribe to unlock additional Super Heroes, missions and rooms for the HQ.

"We're thrilled to bring some of Marvel's beloved characters to life in Super Hero Squad Online," said TQ Jefferson, vice president of games production at Marvel Entertainment. "The world of free-to-play MMO gaming is one that we are excited to be a part of and we look forward to bringing this interactive game to all families."