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>Optimus Prime confronts his Creators and disappears. He is eventually brainwashed and sent to prepare Earth for the arrival of the Quintessons.
>Numerous Transformers have descended into Earth since the Battle of Hong Kong and the government has declared war on them.
>Megatron has reassembled the Decepticons and the Autobots led by Bumblebee are fighting them.
>Cade Yeager (Mark Wahlberg) is a wanted fugitive living in an abandoned scrapyard and helping the Autobots locate their lost comrades. During one of these missions he runs into street-smart orphan Izzy (Isabella Moner) and her pet Autobot Squeeks and they come live with him.
>The government creates a paramilitary anti-Transformers unit led by Ray Santos (Santiago Cabrera). Major William Lennox (Josh Duhamel) is conscripted to help them due to his experience working with the Transformers.
>The Autobots and their human allies find out about a secret connecting the Transformers to Arthurian lore and track down Sir Edmund Burton (Anthony Hopkins), an English nobleman versed in the Arthurian legends and its connection to the Transformers. They're also helped by an literature scholar, Vivian Wembley (Laura Haddock), and a computer expert, Desi (Jarrod Carmichel). Robert Epps (Tyrese Gibson), Seymour Simmons (John Turturro) and Joshua Joyce (Stanley Tucci) eventually help out as well.
>Whatever they do leads to an all-out battle between Autobots, Decepticons and Quintessons in an forgotten structure that evil Optimus seeks to unearth. Optimus is brought back from the dark side by Cade and Bumblebee and helps them battle the Quintessons.
>Whatever they do "opens up a whole new chapter of Transformers stories".
