The movie has quite an interesting storyline where a public relations Major William was knocked out and sent to the battlefield with a squad to fight the invading aliens known as Mimics when he opposed the General's orders. Unknown to them, the aliens behaved like the central nervous system when they were controlled by a central intelligence known as the Omega. William killed an attacking Alpha with a mine before he died, but not before the Alpha's blood spilled onto him, granting him the ability to temporarily take over the Omega's unique ability to reset time back repeatedly to a specific time frame. From a clumsy Major who never ventured to the battlefield to one who managed to gradually anticipate each and every move made by the aliens and avoided their attack until he was killed over and over again, he was able to reset the time loop every single time he died. He met the Angel of Verdun Sergeant Rita Rose in the process and learnt that she possessed the same ability until she lost it through a blood transfusion after getting injured in battle.
With their combined wits, they eventually realized that the Omega set a trap for them instead to reclaim its ability and sacrificed their lives to exterminate the Omega in one final attempt after William too lost his unique ability after he received a blood transfusion. Fortunately, the Omega exploded and spilled all its contents, including its blood, in the water and infused William once again before he died. The time line was reset once again to an earlier time frame when William and Rita were alive but this time with the aliens exterminated permanently.
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