Transformers: Cybertron (Film)

Transformers: Cybetron is the third and final installment of the Transformers Unicron Trilogy reboot film series, which began with Transformers: Armada and Transformers: Energon. It is a science fiction action war film based on the Transformers franchise, more specifically the 2005 series Cybertron.

Plot
Shortly after Unicron was vanquished thanks to Galvatron's sacrifice, a massive black holes forms, threatening Cybertron. The planet's entire population evacuates to Earth, disguisng themselves are vehicles and various machinery. An aging Optimus Prime, who is leading the Autobots as their leader Rodimus remains in a coma, is approached by the spirit of Vector Prime, an ancient Autobot who informs him of the Four Cyber Planet Keys, which will enable him to close the black hole. However, the four keys where lost during a space bridge accident and remain scattered across the universe. Meanwhile, Galvatron emerges from the black hole, along with his treacherous second-in-command Starscream, who align themselves with the remaining Decepticons. Galvatron also learns of the keys and decides to steal them for himself.

A galaxy-wide search ensues, with the Autobots dueling the Decepticons several times. Eventually, the Autobots combine the keys and destroy the black hole as Starscream is sucked into it. Meanwhile, Rodimus finally awakens and Optimus is about to hand leadership back to him when Galvatron attacks Mission City, alone. Optimus tells Rodimus that he will step down once he has defeated his lifelong enemy.

Optimus chases Galvatron through a portal to a meteorite, where they duel. Optimus is badly wounded but vector Prime reappears to him and tells him that he cannot yet make the journey to the Well of All Sparks, not while Galvatron remains at large. Optimus gets back up, now armed with Vector's sword, and charges Galvatron, finally slaying him. The Autobots land on the meteorite, where Optimus finally dies of his wounds. After a funeral, the Autobots and humans celebrate.