Shia LaBeouf 'spent hours' ad-libbing on Transformers 3

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The third and final film in the live action series directed by Michael Bay, "Dark of the Moon" is the sequel to 2009's "Transformers: Revenge of the Fallen". Shia LaBeouf, Josh Duhamel, John Turturro, Kevin Dunn and Tyrese Gibson all return to their roles as the Autobots race to find a Cybertronian spacecraft that's landed on the Moon before the the Decepticons get to it. The secrets hidden here could turn the tide in the Transformers' final battle. Meanwhile new cast additions include Rosie Huntington-Whiteley, Patrick Dempsey and John Malkovich.

July 5th, 2011

Shia LaBeouf spent hours ad-libbing on the set of 'Transformers: Dark of the Moon'.

The actor - who portrays Sam Witwicky in the robot-fighting franchise - was pleased the technology used to make the film meant it was possible to shoot for hours at a time, and then later remove the unnecessary footage.

He said: "Because we're 3-D, you're shooting digital all the time," LaBeouf told MTV News. "The beauty for us is, let's say I'm doing a scene with [John] Malkovich or Frances [McDormand] or [Patrick] Dempsey or even Rosie [Huntington-Whiteley] - we'd just riff. You've got hours and hours of all that - where you're just riffing and ad libbing and trying to come up with lines."

Director Michael Bay was still working on the final edit of the movie - which runs to two hours and 40 minutes - just weeks before it was due to hit cinemas, but none of the cast were unhappy to see their scenes end up on the cutting room floor.

Rosie said: "I trust Michael so much on his judgment. He's made every single cast member look fantastic in this movie, and it's a long film, so he really has to choose the best scenes and what makes sense to the story line."

John added to MTV News: "You're a figure in someone else's dream, and however their dream plays out is the way it is."