Sebastian Shaw is one of the overarching antagonists(alongside Apocalypse) of the X-Men film series, appearing as the main antagonist of X-Men: First Class and a posthumous antagonist of X-Men, X2: X-Men United, X-Men: The Last Stand, X-Men: Days of Future Past and X-Men: Apocalypse.
He was a former Nazi scientist who formed the Hellfire Club and planned to start a nuclear war between the United States and the Soviet Union to make mutants the dominant species of the Earth. He was confronted by the X-Men assembled by Charles Xavier and Magneto, the latter of whose mother Shaw killed during WWII. During a final stand against the X-Men, Magneto avenged his mother by killing the nefarious mutant.
He is portrayed by Kevin Bacon.
X-men: First Class
Sebastian Shaw (under the alias Dr. Klaus Schmidt) was a scientist working for the Nazis during WWII. He was present in the concentration camp where a young Erik Lehnsherr's mutant powers first manifested, witnessing him open a gate with his mutant power from a window. Shaw attempted to coax the boy with chocolate into consciously using his ability but to no avail, with Erik claiming that he wanted to see his mother: Shaw did as requested. However, he threatened his mother's life if he did not move a small silver coin by the time he counted to three. When Erik failed to do so, Shaw shot his mother dead. This enraged him greatly, causing him to lash out with his powers to Shaw's delight, killing two guards and devastating the metal components of two separate rooms. He then congratulated the traumatized young mutant. For the next eighteen years or so, Shaw tortured young Erik, attempting to see his powers in action again.
18 years later, Sebastian emerged as the leader of the Hellfire Club, a group of mutants with aspirations of world domination. He was observed in Las Vegas by CIA Agent Moira MacTaggert meeting with U.S. Army Colonel Hendry (previously lured in by Emma Frost, under the influence that she was a stripper) where he threatens him into supporting the building of American missile sites in Turkey, near the Russian border. When MacTaggert witnesses Shaw's henchmen Azazel (who can teleport) and Riptide (who can create tornadoes by spinning his body) using their powers, she attempts to warn her superiors; but Shaw has Azazel teleport Hendry to a Joint Chiefs meeting where he voices his support of the plan. Later, when Hendry comes to Sebastian's yacht to collect his payment, he attempts to have him killed. But the Colonel pulls out a grenade and threatens to blow them all up if they refuse to let him go. Shaw orders him to pull the pin on the grenade before he plucks the explosive from his hand and triggers it himself, displaying his mutant power by absorbing the energy from the explosion. In response to Hendry's reaction that he was a mutant, he releases the energy at Hendry, killing him instantly.
That night, a now adult and vengeful Erik Lehnsherr, who had been hunting Shaw, sneaks aboard the yacht and attempts to murder the man who'd tortured him; only to be overwhelmed by Emma Frost's telepathy. At the same time, the U.S. Coast Guard arrived along with MacTaggert and mutant telepath Charles Xavier to apprehend him. Frost used her powers to shield Shaw from him and they all made their way to their submarine and narrowly escaped capture.
On their way to meet with a Soviet general, Frost senses Xavier's enhanced telepathy (through use of Cerebro) and informs Sebastian that he is recruiting his own team of mutants, consisting of Dr. Hank McCoy, Angel Salvadore, Sean Cassidy, Alex Summers, Raven Darkholme and Armando Muñoz. Shaw reveals a helmet he had built by the Russians that shields him from telepathic influence and orders her to meet with the general in his place.
Shaw, Azazel and Riptide, in an attempt to kill Xavier attack the Division X facility. While Azazel and Riptide were slaughtering the CIA agents, Shaw entered through the entrance and demanded the location of Xavier's mutant entourage, threatening the life of a CIA agent. Multiple guards arrived and attempted to kill Shaw, but he absorbed the bullets and a rocket from an RPG and killed the surrounding guards with the released energy. Shaw located the mutants and introduced himself to them, offering them a chance to join him in his plans for mutant mobocracy. He had convinced Salvadore and Muñoz to join his team, but unaware to Shaw, Muñoz used the opportunity to attack Shaw. He absorbed one of Summers' energy rings and placed it inside Muñoz. Shaw, Angel, Riptide and Azazel teleported away from the following explosion which killed Muñoz.
Shaw proceeds to Russia, where he meets with the Soviet general he sent Frost to see during which she was captured by Lehnsherr and Xavier; forcing the man to send Soviet missiles to Cuba. It is his plan to goad the U.S. and Soviet Union to use nuclear weapons on each other, causing WWIII which will cripple human civilization and allow mutants to rise up and rule. He accompanies the Russian fleet in his submarine to assure that the missiles reach their destination, but he is tracked by Xavier and his team.
Lehnsherr uses his powers to lift the sub from the water before they both crash on a nearby beach. Shaw attempts to absorb the energy from the sub's nuclear reactor (becoming a human atom bomb) but is foiled by Lehnsherr. The two fight and Sebastian has the upper hand, until Erik manages to remove his helmet allowing Xavier to mentally freeze his body. Lehnsherr then takes Shaw's helmet for himself and uses his ability to force the Nazi gold coin he still kept from his childhood (unforgiving of him killing his mother) and pierced it through Shaw's brain, killing him, avenging his mother's death as well as the humans and the mutants he killed. His body was then used by Erik as a dummy, as a means of showing he was now in charge to Shaw's former comrades.