Flash is a DC Comics superhero identity used by several speedsters, most famously Barry Allen. As the Scarlet Speedster, the Flash can move at superhuman speeds, react in an instant, and use the Speed Force to perform extraordinary feats such as time travel and dimensional travel. In the DC Universe, Flash is a key member of the Justice League and often serves as both a science-minded hero and a central figure in stories about heroism, sacrifice, and the consequences of altering time.