In December 2022, biology teacher and former Green Beret Dan Forester fails to get a job at a prestigious research center. While watching the World Cup, soldiers from the year 2051 arrive to warn that humanity is on the brink of extinction due to a war with alien invaders referred to as the "Whitespikes." The Whitespikes will arrive in November 2048 and kill the majority of humanity three years later. In response, the world's militaries are sent into the future via a wormhole device called the "Jumplink," but fewer than 20% survive deployment to return in 7 days, prompting an international draft. Dan receives a notice that he has been drafted and reports with other draftees to basic training. Dan deduces with fellow draftee Charlie that to prevent a paradox, those drafted have already died before the war starts. The draftees are sent forward in time to a battlefield on Miami Beach but few survive, having accidentally been dropped high above the city. The field commander, Colonel Forester, orders the draftees to rescue nearby lab personnel before the area is sterilized. They discover the lab personnel are already dead but recover their research. Dan radios command about the situation, and he is told that no help will be sent to rescue the stranded troops. Nearly everyone dies, except for Charlie, Dan, and a soldier named Dorian. The survivors wake up in a military encampment in the Dominican Republic. Dan reports to Col. Forester, who turns out to be his grown daughter Muri. She requests he accompany her on a mission to capture a female Whitespike, which are rarer than the males typically encountered. They trap and cage the female, only to have hundreds of males descend on their position. As the helicopter with the female lifts off, Dan and Muri escape to a beach and radio for rescue. Muri reveals to Dan that, dissatisfied with his life after losing the job, he abandons his family and dies in a car crash in 2030. Dan, Muri and the female Whitespike are transported to a fortified oil rig close to Port Nelson, where the Jumplink is located. Dan and Muri create a toxin that can kill the Whitespikes. The Whitespikes attack and overrun the base to free the female, and Muri sacrifices herself to send Dan back to the past. Although he returns to 2023 with the toxin, the Jumplink is destroyed. The world interprets the Jumplink's destruction as a sign that the future war is lost.