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In 484 AD, Merlin finds the Knights of Iacon, a group of Transformers hiding on Earth, seeking their help to aid King Arthur and his knights. They hand him a staff and help Arthur defeat the Saxons, but warn Merlin to hide the staff.

In the present, five years after the Hong Kong incident,[N 1] Optimus Prime arrives on the ruins of Cybertron and meets the mad Cybertronian goddess Quintessa,[N 2] who brainwashes him into Nemesis Prime, and sends him to Earth to retrieve Merlin's staff, to restore the planet by taking Earth's energy core.

On Earth, a new paramilitary task force called the Transformers Reaction Force (TRF) continues to hunt Transformers, while some of its U.S. military personnel, including Colonel William Lennox and General Morshower, are reluctantly against its actions. Cade Yeager, an ally to the Autobots, hides Transformer refugees in his junkyard. In a war-torn Chicago, Cade and Bumblebee meet a scavenger Izabella and her Transformer companion, Sqweeks, before encountering a dying Transformer who gives them a talisman. The TRF confronts Cade to demand the Autobots' location, only to be stopped by Bumblebee, Lennox, and Hound.

Megatron, having abandoned his Galvatron identity[N 1], his remaining Decepticons, and the U.S. government learn of the talisman's value and reluctantly join forces to retrieve it and track Bumblebee to Cade's scrapyard. While the Autobots fend off the Decepticons, Grimlock and the Dinobots ambush a TRF convoy while Cade, his assistant Jimmy, Izabella, and Sqweeks deal with a swarm of TRF drones sent after them. Cogman, a human-sized Transformer, appears and invites Cade to the United Kingdom to meet his employer, Sir Edmund Burton, who is connected to the Transformers. Burton asks another Transformer, Hot Rod, to find Viviane Wembly, a University of Oxford professor.