Transformers One is an upcoming American animated science fiction action film based on Hasbro's Transformers toy line. Directed by Josh Cooley, the ensemble voice cast includes Chris Hemsworth, Brian Tyree Henry, Scarlett Johansson, Keegan-Michael Key, Steve Buscemi, Laurence Fishburne, and Jon Hamm. The film depicts the origins and early relationship of Optimus Prime and Megatron and how they forever changed the fate of Cybertron, the home planet of the Transformers. It is the eighth installment overall of the Transformers film series, and the franchise's first theatrical animated feature film since The Transformers: The Movie (1986).

Transformers is a media franchise produced by American toy company Hasbro and Japanese toy company Takara Tomy. It primarily follows the heroic Autobots and the villainous Decepticons, two alien robot factions at war that can transform into other forms, such as vehicles and animals. The franchise encompasses toys, animation, comic books, video games and films. As of 2011, it generated more than ¥2 trillion in revenue, making it one of the highest-grossing media franchises of all time.