Sentinel Prime - New Transformer Debuts on Dark of the Moon

Sentinel Prime was actually mentioned in Transformers: Revenge of the Fallen, when Sam Witwicky (Shia LaBeouf) said his name while he was in an All Spark-induced trance.

Empire magazine has the largest stars of the upcoming summer movie season — Sentinel Prime and Optimus from Transformers: Dark of the Moon, Michael Bay's third installment of the robot franchise. The cover reveals the new baddie Sentinel Prime, the mysterious transformer shown on the moon at the end of the movie's teaser trailer and according to the article in Empire, he's an autobot and is described as a big brother mentor to Optimus.

Transformers 3: Dark of the Moon - Movie Stills

Transformers 3: Dark of the Moon - Trailers

Official Trailer




Teaser Trailer



Super Bowl Trailer

Transformers 3: Dark of the Moon Movie Poster

Transformers 3: Dark of the Moon Casts

Shia LaBeouf - Sam Witwicky
Rosie Huntington-Whiteley - Carly
Hugo Weaving - Megatron (voice)
Josh Duhamel - Major William Lennox
Patrick Dempsey - William
John Malkovich - Bruce
Leonard Nimoy - Sentinel Prime (voice)
Tyrese Gibson - Robert Epps
Alan Tudyk - Dutch
John Turturro - Simmons
Peter Cullen - Optimus Prime (voice)
Kevin Dunn - Ron Witwicky
Julie White - Judy Witwicky
Charles Adler - Starscream (voice)

Transformers: Dark of the Moon - Synopsis

The Autobots Bumblebee, Ratchet, Ironhide and Sideswipe led by Optimus Prime, are back in action, taking on the evil Decepticons, who are determined to avenge their defeat in 2009s Transformers Revenge of the Fallen. In this new movie, the Autobots and Decepticons become involved in a perilous space race between the U.S. and Russia, and once again human Sam Witwicky has to come to the aid of his robot friends. There's new characters too, including a new villain in the form of Shockwave, a longtime "Transformers" character who rules Cybertron while the Autobots and Decepticons battle it out on Earth.

Source:  http://www.imdb.com/title/tt1399103/synopsis