The younger brother of the reluctant leader of the X-Men, Cyclops, Alex Summers has been fighting for the peaceful coexistence of mutants and humans most of his life. Gifted with the ability to absorb ambient cosmic energy into the cells of his body and processes it into a blast that is so hot, the byproduct is plasma, Alex and his brothers are powerful adversaries. Originally a seasonal member of the X-Men with his long-time love Polaris, Alex has been mind controlled many times to battle his teammates and loved ones, even having an affair with his brother's wife Madelyne Pryor-Summers. After being informed of the many terrorist attacks of mutants, Alex left Lorna and joined the X-Men, until he entered the Siege Perilous and exited a Genoshian Magistrate. After being reminded of who he really was, Alex stayed on Genosha to aid with the rebuilding, until Professor Charles Xavier and Cyclops asked him to lead a new team of X-Factor. Always believing he was under the shadow of his brother, the brilliant tactician, Alex worked hard to prove himself as a Summers.