In the future world, the world is in a panic of alien invasion. Military orator Major Cage (Tom Cruise) is afraid to go to the battlefield. He never thought that the general (Brendan Gleeson) would let him command the upcoming "Normandy Campaign". After refusing to accept the order, the general actually played a trick on him, that is, throwing him into the barracks as a deserter. Cage was assigned to the J team to fight, and died tragically on the first day of the battle. Unexpectedly, this death gave him the ability to cycle through time and space, and the only person who believed in him was Rita Volataski (Emily Blunt), known as the "Full Metal Warrior". The two began to fight in a time and space cycle. While training Cage, they discovered the secret of controlling time, which was related to the alien "mastermind" Omega, but the only way to win was to let Cage die and restart time. While repeating the battle on the day of landing, Cage increasingly didn't want to lose Rita...