Transformers: Revenge of the Fallen, also known as Transformers 2, is a 2009 British-American science fiction action film directed by Michael Bay and executive produced by Steven Spielberg. It is a sequel to the 2007 film Transformers and the second installment in the live-action Transformers film series taking place two years after its predecessor. The plot revolves around Sam Witwicky, who is caught in the war between two factions of alien robots, the Autobots, lead by Optimus Prime and the Decepticons, lead by Megatron. Sam is having strange visions of Cybertronian symbols, and being hunted by the Decepticons under the orders of an ancient Decepticon named The Fallen, who seeks to get revenge on Earth by finding and activating a machine that would provide the Decepticons with an energon source, destroying the sun and all life on Earth in the process. This is the first film to feature the largest cast and Transformers, including the Constructicons for the first time in the series. Returning Transformers include Optimus Prime, Bumblebee, Ironhide, Ratchet, Megatron, Starscream, Bonecrusher and Scorponok.