You can watch the "Transformers 3" trailer on YouTube, RottenTomatoes.com and the trailers page of Apple.com. The websites offer multiple trailers for the film available in both standard- and high-definition formats.
"Transformers: Dark Side of the Moon" is the third film in Michael Bay's "Transformers" movie franchise. The film stars Shia LaBeouf as Sam Witwicky, a suburban kid who assists his robot allies after the discovery of a mysterious lunar spacecraft ignites a battle between the Autobots and Decepticons. Paramount released the film in June 2011, and it grossed $352 million in the United States to become the second highest-grossing film of the year.