On Cybertron, the Autobot resistance, led by Optimus Prime, are on the verge of losing the civil war with the Decepticons and prepare to evacuate the planet. A Decepticon force, led by Soundwave, Shockwave and Starscream, intercept them during the evacuation, and Optimus sends B-127 to Earth on an Escape pod in order to set up a base of operations where the Autobots can regroup. However, Decepticon seekers Starscream, Thundercracker and Skywarp destroy the launch pad during the escape.
In 1987, B-127 reaches Earth alone, crash-landing in California and disrupting a training exercise by Sector 7, a secret government agency that monitors extraterrestrial activity on Earth. Colonel Jack Burns presumes B-127 to be a hostile invader and attacks, driving B-127 into the forest, where the Decepticon Blitzwing ambushes him. When B-127 refuses to reveal Optimus’s whereabouts, Blitzwing tears out his voice box and damages his memory core; despite this, B-127 kills Blitzwing. Before collapsing from his injuries, B-127 scans a nearby 1967 Volkswagen Beetle.
Meanwhile, teenage girl Charlie Watson remains traumatized by the death of her father, and resentful of her mother Sally for remarrying. Charlie finds a yellow Volkswagen Beetle in a scrapyard belonging to Hank, who gives it to her as an 18th birthday present. Charlie unknowingly activates a homing signal that is detected by Decepticons Shatter and Dropkick as they interrogate and execute Autobot Cliffjumper on one of Saturn’s moons. The pair head to Earth, and pretend to be peacekeepers, persuading Sector 7 to help them find and capture B-127, whom they claim is a fugitive.
Starring: Hailee Steinfeld, John Cena, Jorge Lendeborg Jr., John Ortiz, Jason Drucker, Pamela Adlon,