In the future, robots known as Sentinels are exterminating mutants and their human allies. A band of mutants, including Kitty Pryde, Colossus, Iceman, Bishop, Warpath, Blink and Sunspot, evade the Sentinels due to Pryde's ability to send a person's consciousness to the past. Pryde's group convenes with Logan, Storm, Professor Charles Xavier, and Magneto at a monastery in China. Pryde sends Logan's consciousness 50 years back in time to 1973 to prevent Mystique from assassinating Dr. Bolivar Trask, creator of the Sentinels. Following the assassination, Mystique was captured, and her DNA was used by Trask's company to improve the Sentinels, whose ability to adapt to any mutant power makes them almost invincible. Xavier and Lehnsherr advise Logan to find both of their younger selves for help.

At the X-Mansion in 1973, Logan encounters Xavier and Hank McCoy. Xavier's Institute for Gifted Youngsters has closed after most of the teachers and students were drafted to the Vietnam War. Xavier, a broken man, has been overusing a serum that allows him to walk, but suppresses his telepathy. Logan explains his mission and persuades Xavier to help free Lehnsherr from a prison cell beneath The Pentagon, where he is being held for allegedly assassinating President John F. Kennedy. They rescue Lehnsherr with the help of Peter Maximoff, a mutant with super speed.

In Washington, D.C., Trask unsuccessfully tries to sway Congress to gain support for his Sentinel program. Meanwhile, in Saigon, Mystique prevents William Stryker from appropriating a group of mutant G.I.s for Trask's research. Mystique investigates Trask's office and discovers he has been capturing mutants to use for his experiments (most of them from X-Men: First Class). Xavier, Lehnsherr, McCoy, and Logan fly to Paris to intercept Mystique, who is impersonating a North Vietnamese general to infiltrate the Paris Peace Accords. There, Trask attempts to sell his Sentinel technology to Communist nations. Xavier's group arrives as Mystique is about to kill Trask. Lehnsherr tries to kill Mystique to ensure her DNA cannot be used for the Sentinels, but she jumps from a window. The fight spills onto the street in view of the public, allowing Lehnsherr and Mystique to escape.

Trask is saved, but the world is horrified by the existence of mutants. President Richard Nixon approves Trask's Sentinel program and arranges an unveiling ceremony. Trask's scientists recover Mystique's blood from the street. Meanwhile, Lehnsherr

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