Marvel OverPower is a CCG that centres on the heroes and villains of the Marvel Comics universe. In OP, two (or more, although this isn't officially supported) players create teams of four heroes and villains. These teams do not have to be on the same side (you can have, say, Spider-Man and Rhino on the same team), and team members can be teams themselves (like the Enforcers...tee hee). There is also a DC Overpower set, based on DC comics, and there is an Image OverPower, focusing on Image characters. So far, seven sets have been released for Marvel, as well as two sets for DC and one for Image.