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The fourth installment in the Transformers sci-fi/action series, this takes place four years after an epic battle saves the world, but leaves Chicago/114087/">Chicago in tatters. Autobots and Decepticons are no longer wanted on Earth by humans and have gone into hiding.

Humans begin making their own Transformers out of a rare metal, using the Decepticons as models. When automobile mechanic Cade Yeager (Mark Wahlberg) brings home an old truck, he and his daughter Tessa (Nicola Peltz) soon realize it's a Transformer, and not just any Transformer — Optimus Prime.

With some human help, Optimus Prime and the Autobots rise to meet their most fearsome challenges yet, including a Decepticon named Lockdown, who is sent to destroy the Autobots. Humans and robots alike are swept up in a war of good and evil, ultimately leading to a climactic worldwide battle.