Transformers: Revenge of the Fallen is a 2009 American science fiction action film which was released on June 19, 2009 in the United Kingdom and June 24, 2009 in North America. It is the sequel to 2007's Transformers, which was the first live action Transformers film. Michael Bay and Steven Spielberg return respectively as director and executive producer, while Shia LaBeouf reprises the role of Sam Witwicky, the human caught in the war between Autobots and Decepticons. The film introduces many more robots and the scope has been expanded to numerous countries, most notably France and Egypt.

A major hurdle that was overcome during the film's production was the 2007–2008 Writers Guild of America strike, as well as possible strikes by the Directors Guild of America and the Screen Actors Guild. Bay finished the production on time with the help of previsualization and a scriptment by his writers Roberto Orci, Alex Kurtzman, and series newcomer Ehren Kruger. Shooting took place from May to November 2008. 

Source: Wikipedia