Agent William Stryker Sr.

William Stryker Sr. is the senary antagonist of the 2011 X-Men movie prequel X-Men: First Class. He is a CIA agent, the father of Colonel William and grandfather of Jason Stryker. He shares his son's hatred of mutants.

X-Men: First Class
In 1962, during the Cuban Missile Crisis Stryker was seen sitting next to his superior John McCone. Stryker says to McCone that Colonel Robert Hendry, who agreed to putting Jupiter Muscles in Turkey after threated by Sebastian Shaw and  the Hellfire Club, is planning to start World War 3. When Charles Xavier is brought to the CIA by Agent Moira MacTaggert to explain the possible existence of mutants to him and McCone, Stryker and McCone do not believe him. However just as they are about to leave, Charles attempts to convince by telling them about his mind reading powers. At first, Stryker believes it's a trick like one he has seen at a magic show, however, once Charles asks about his son William and the Jupiter Muscles in Turkey they suspect he is a spy, until Charles' foster sister  Raven shape shifts into Stryker himself convincing them. Upon learning of mutants existence, Stryker develops the same xenophobic hatred of mutants his son would develop. When the CIA were about to send their mutant team Division X to go after Shaw, Stryker was against it, seeing the mutants as untrained, unauthorized freaks, but he rebuffed. After Charles, MacTaggart, and Erik Lensherr return from Russia and successfully capture his right-hand woman and lover Emma Frost, Stryker has her imprisoned. McCone says the law requires that they turn her into the government but Stryker tells him that the law applies to human not mutants.