Scott Philip Summers, most well-known by his operational nom de guerre of "Cyclops", was an American-born mutant and 'superhero' notable for being a founder and leader of the X-Men. He later styled himself as a mutant revolutionary, dedicating himself to the defense of mutantkind across the globe. He is the elder brother to both Alex and Gabriel Summers, the eldest son of Christopher and Katherine Summers, and the husband of Emma Summers.