In 2028, Earth is suffering from a global energy crisis. The space agencies of the world prepare to test the Shepard particle accelerator aboard the orbiting Cloverfield Station, which would provide Earth with infinite energy, while conspiracy theorists fear it will create the "Cloverfield Paradox", opening portals to allow horrors from parallel universes to threaten Earth. Among the crew is Ava Hamilton, a British engineer who frets about leaving her husband Michael potentially for years, as their relationship struggles since the loss of their children to a house fire. The crew is rounded out by American commander Kiel, German physicist Ernst Schmidt, Brazilian medical doctor Monk Acosta, Irish engineer Mundy, Russian engineer Volkov, and Chinese engineer Tam.

After about two years of unsuccessful testing of the Shepard, they eventually achieve a seemingly stable beam, but it then overloads and creates a power surge on the station. After restoring basic power, they find Earth has vanished from view, and the gyroscope that aids in the station's navigation is missing. As the crew work on repairs, strange events begin to occur, including finding an unfamiliar woman called Mina Jensen fused with wires inside a wall. Volkov fears something crawling beneath his skin and is compelled to craft a gun using an on-board 3D printer. He uses the gun to threaten the crew, but as he does so he convulses and dies, and the station's colony of worms bursts out of him. Jensen tells Ava not to trust Schmidt, who is soon discovered to be a spy sent by the German government to keep the Shepard shut down. Mundy's arm gets pulled into a solid wall and is severed clean off, without bleeding or pain. They find the arm roaming of its own volition. When they recognize that it is trying to write something, it instructs them to "cut Volkov open". Once they do, they find the missing gyroscope. They quickly locate Earth and restore their communications, but transmissions state that Cloverfield Station was destroyed and fell to Earth two days prior.

The crew determine they have moved to a different universe; Jensen is found to be a crew member of the space station from this universe. Here, Hamilton's children did not die, she stayed on Earth as a civilian engineer, and Jensen replaced Tam as the station's engineer. They plan to reactivate the Shepard device to return to their own universe. While the crew repair the station, Tam works out a means to make Shepard work properly, but she is killed in a freak accident. Meanwhile, Hamilton decides to return with Jensen to Earth to be with her children. As they prepare, Mundy is killed in an explosion caused by a strange magnetic field. After the explosion, Kiel sacrifices himself to disengage a wildly-spinning accelerator ring that was jeopardizing the station, leaving Hamilton in charge.

On Earth, Michael wakes up to discover a wave of destruction ravaging the planet, witnessing the silhouette of a giant monster in the distance. On his way to offer his assistance at the local hospital, he stops to help a young girl named Molly at a dockyard. After learning that the hospital has been destroyed, he takes her to an underground shelter belonging to a friend and tends to her wounds.

With Shepard ready to activate again, Hamilton prepares to leave with Jensen, but Jensen suddenly knocks her out. Jensen kills Monk with Volkov's gun, wounds Schmidt, and insists that the station must stay in her universe to keep the Shepard device there. Regaining consciousness, Hamilton uses the gun to shoot out a window, ejecting Jensen into space. Hamilton decides to return to their universe with Schmidt and makes a recording for her alternate universe self, giving her the plans for the Shepard device and stressing the importance of her family. Hamilton and Schmidt reverse the universe shift and use Tam's modifications to finally make Shepard work. After reporting in, the two eject themselves in an evacuation capsule towards Earth.

Michael learns from mission control of the station's reappearance and his wife's return to Earth, but he lambasts mission control for not warning Hamilton not to return to Earth in light of the ongoing situation. As the capsule re-enters the Earth's atmosphere, a giant monster comes up, roaring through the mist of a mountain.

https://en.wikipedia.org/wiki/The_Cloverfield_Paradox
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