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The illustration in the infobox is the Saint Sebastian of Il Sodoma, at the Pitti Palace, Florence.
As a protector from the plague, Sebastian was formerly one of the Fourteen Holy Helpers.
Sebastian, like Saint George, was one of a class of military martyrs and soldier saints of the Early Christian Church, whose cults originated in the 4th century and culminated at the end of the Middle Ages, in the 14th and 15th centuries, both in the East and the West.
SebastianShaw is a mutant with the ability to absorb kinetic energy and to use it in an unknown manner to enhance his own physical strength, speed, and stamina.
Shaw was, of course, a key part of the corruption of Phoenix into Dark Phoenix, as well as the Hellfire Club's battle with the X-Men against Nimrod, during which he was thrown into the upper atmosphere by the future Sentinel, then caught by Harry Leland's power and slammed at phenomenal speed into Nimrod.
Shaw's first move upon recovery from the bomb was to contact the man named Holocaust, who had crossed over from the "Age of Apocalypse." In exchange for a new armored containment suit, Holocaust agreed to help Shaw capture X-Force, which he did with frightful ease.