<P> Sentinel nearly kills Optimus, but Megatron, convinced by Carly Spencer that he would end up working for Sentinel unless he could get rid of him, turns on Sentinel and severely injures him . Upon seeing Cybertron being destroyed with the space bridge, Megatron attempts to make a false truce with Optimus, but Optimus doesn't fall for it and kills Megatron and Sentinel . While the loss of human life in Chicago is massive, the battle is a major victory for the Autobots as they eliminated most of the Decepticon army on Earth (including Gould by traitor) despite there being some still scattered around the globe and the entire Decepticon command structure was destroyed with all of its members killed in the battle . </P> <P> While the regular Decepticons do not actually appear in Transformers: Age of Extinction (except Megatron who was reborn as Galvatron), they do play a role in the story as secondary antagonists . The "Battle for Chicago" (climatic battle of Dark of the Moon) has become a 9 / 11 like event to the public 5 years after the third film and a ruthless government organization named Cemetery Wind have begun hunting Decepticons who are still scattered around the globe and secretly hunted Autobots alike when the alliance between humans and Autobts ended (including alliance between humans and Decepticons as Dylan Gould is already dead). It was mentioned that there might still be less than a dozen Decepticons and Autobots hiding on the planet Earth by Harold Attinger (Kelsey Grammer). The film's antagonist is instead the neutral bounty hunter Lockdown, who may have been a Decepticon at one point, sent to Earth to hunt Optimus Prime by the Transformers' creator race (unseen in the movie). Lockdown and Attinger make a three - way deal along with a company named K.S.I., Kinetic Solutions Incorporated, by the boss, Joshua Joyce, who uses the original Decepticons' (and Autobots') remains to build new Transformer prototypes which can be controlled by humans and must eliminate those who cross their path as the Yeager family to know this secret . </P> <P> Their crown jewel is Galvatron, who becomes possessed by Megatron's (Frank Welker) consciousness and then possesses the other prototypes and turns them into Decepticons controlled by him . Galvatron plans to use the Seed, a device that can create Transformium, the metal Transformers are made of, to rebuild his Decepticon army and conquer Earth, when Joyce was called by Cade Yeager, and knowing that he was manipulated by Attinger and Galvatron, and escapes with the Seed . After the final battle in Hong Kong, all the Decepticons' are destroyed by Cade, the Autobots and Dinobots, except Galvatron, who escapes after Lockdown and Attinger are killed by Optimus Prime, vowing to return one day, for he is reborn, before Cemetery Wind dissolved by their crimes and branded as terrorist organization . </P> <P> Barricade, Soundwave and a number of other Decepticon "protoform drones" appear in archival footage from Dark of the Moon presented by Attinger . Various deceased Autobots and Decepticons appear throughout the film in Chicago and in the KSI lab, including Megatron's head . </P>

Who is the leader of the decepticons in transformers 4