Set in 1994, the film follows ex-military electronics expert Noah Diaz and museum intern Elena Wallace as they become entwined in a battle involving the Autobots, Maximals, and Terrorcons.
The Maximals, robotic beings that transform into animals like gorillas and falcons, flee their homeworld to Earth to protect the Transwarp Key - a device capable of opening portals through time and space.
Their pursuers, the Terrorcons, led by Scourge, seek the key to bring the planet-consuming Unicron to Earth.
As alliances form between humans and Transformers, they unite to prevent Earth's destruction .