Transformers Age of Extinction

Sixty-five million years ago, during the Cretaceous Period, beings known as the Creators detonate many "Seeds", wiping out most life on Earth. In the present, a geologist named Darcy discovers a dinosaur corpse covered in a strange metal.

Four years have passed since the Battle of Chicago. Cade Yeager, a struggling inventor, and his friend Lucas buy an old truck to strip it for parts in hopes of sending Cade's daughter Tessa to college. Cade soon discovers that the truck is an injured Optimus Prime and repairs him. Meanwhile, Cemetery Wind, an elite CIA unit headed by paranoid agent Harold Attinger, has been tasked with hunting down the remaining Decepticons. However, he also secretly hunts down the Autobots. With the aid of the Transformer bounty hunter Lockdown, they ambush and brutally kill Ratchet when they found him hiding on a stern of an abandoned ship. After locating Optimus in Texas, the unit and Lockdown travel there and threaten Cade, Tessa, and Lucas. Optimus comes out of hiding and attacks the operatives, allowing Cade and his friends to escape. They are saved by Shane Dyson, Tessa's secret boyfriend, and after a lengthy chase they escape. However, Lucas is killed by Lockdown's grenade. Optimus rallies the last remaining Autobots: Bumblebee, Hound, Drift, and Crosshairs. Cade hacks into a drone he took from the attack in Texas, and learns that the remaining member of the Wreckers, Leadfoot was killed and that Cemetery Wind is working with a corporation called KSI. They decide to infiltrate KSI headquarters in Chicago for information.

Meanwhile, Joshua Joyce, the head of KSI, shows Darcy that he has perfected transformium, a codeable, molecularly unstable metal that the Transformers are made of. He has imprisoned Brains to decode dead Transformers' brains and utilize their data for the human-created Transformers. He shows Darcy his prized creation, Galvatron, who was created using data from Megatron's brain.

Once he infiltrates the facility, Cade finds the KSI scientists melting down Ratchet's head. Infuriated, Optimus and the Autobots storm the facility, break Brains out, and start to destroy it. Joyce stops them and explains that humans don't need Autobots anymore, as they can create their own Transformer soldiers. Disgusted, the Autobots leave the facility. Attinger forces Joyce to launch Galvatron and Stinger to pursue the Autobots. Galvatron and Optimus battle before Lockdown shoots Optimus. Tessa gets trapped and she, along with Optimus, are brought aboard Lockdown's ship. He locks Optimus in the middle of his trophy room, which also carries the Dinobots, legendary knights that Lockdown imprisoned. He explains that the Creators want Optimus back. Before he leaves, Lockdown gives Attinger a Seed, a bomb that can cyberform any area of land, giving Cade, Shane, and the Autobots time to board the ship. Cade and Shane save Tessa, and, with the help of Crosshairs and Bumblebee, are able to escape. Shortly after, Hound and Drift save Optimus and escape before Lockdown's ship enters deep space. Optimus and Brains reveal that Galvatron is Megatron reincarnated, and that he has been manipulating KSI to make an army and steal the Seed in order to wipe out humans and create more Decepticons. Cade warns Joyce, who retreats to Hong Kong with Darcy and his business associate Su Yueming to get a military extraction, thus betraying Attinger.

In Beijing, Galvatron activates by himself and corrupts all prototype Transformer drones to do his bidding. One of his minions shoots down the Autobots' ship. Hound and Bumblebee jump out and struggle to protect the humans. Knowing this, Optimus releases and tames the Dinobots. With their help, they destroy Galvatron's army. Lockdown then appears and uses a magnetic weapon in an effort to reclaim Optimus and the Dinobots. However, Optimus destroys it and proceeds to fight Lockdown. Cade tries to help but is held at gunpoint by Attinger. Seeing Cade in danger, Optimus kills Attinger, which allows Lockdown to gain the upper hand and impale Optimus with his own sword. Cade and Bumblebee distract Lockdown while Tessa and Shane take the sword out of Optimus, who proceeds to kill Lockdown. Galvatron retreats, vowing to battle Optimus another day. Optimus sets the Dinobots free before flying into space with the Seed, sending a message to the Creators to leave Earth alone and that he is coming for them.