Humans are at war with the Transformers, and Optimus Prime is gone. The key to saving the future lies buried in the secrets of the past and the hidden history of Transformers on Earth. Now, it's up to the unlikely alliance of Cade Yeager (Mark Wahlberg), Bumblebee, an English lord (Anthony Hopkins) and an Oxford professor (Laura Haddock) to save the world.
Matt Brody is a former Olympic swimmer who wants to join an elite team of lifeguards led by the hulking Mitch Buchannon. Brody thinks he's a shoo-in, but his casual attitude starts to instantly rub Mitch the wrong way. When drugs and a shady resort owner pose a threat to the bay, Mitch and Matt must put their differences aside to spring into action and save the day.