Paramount Pictures said Friday it is the most-viewed trailer in the Web site's history.
"When a mysterious event from Earth's past erupts into the present day, it threatens to bring a war to Earth so big that the Transformers alone will not be able to save us," said a synopsis released by the studio.
The third installment of the "Transformers" franchise stars Shia LaBeouf, John Turturro, Josh Duhamel, Tyrese Gibson, Rosie Huntington-Whiteley, Patrick Dempsey, Kevin Dunn, John Malkovich and Frances McDormand.
"'Transformers' represents big summer fun at the movies and iTunes Movie Trailers was the ideal place to debut the latest installment to a global entertainment audience," Amy Powell, Paramount Pictures' executive vice president of interactive marketing and film production, said in a statement.
Notable deaths of 2014 [PHOTOS]
Meg Ryan, Kiernan Shipka to star in 'Fan Girl'