Is 'Transformers: Dark of the Moon' Shia LaBeouf's Last Hurrah?

'Transformers: Dark of the Moon' explodes into theatres June 29, and the third film in the blockbuster franchise promises to be the best one yet. But will this be the last 'Transformers' for Shia LaBeouf?

The loaded question tripped up Shia a little bit as he spoke to our own Mark Steines above Red Square in Moscow, where the world premiere is set to take place on Thursday.

"I really, honestly -- not because I don't like making them; I love making them, I love [director Michael Bay], I love doing the movies -- I don't have anything else to contribute. I don't think you can take [my character] Sam anywhere," says Shia. "He's done."

This time around, Shia's Sam Witwicky has a new girlfriend in Rosie Huntington-Whiteley and a new villain in Patrick Dempsey as mankind takes a stand against the evil Decepticons alongside the good-guy Autobots. The incredible action in the movie moves from such locations as our nation's capitol and the Windy City to such far-flung locales as China and Russia, where the film's world premiere takes place on Thursday.

"It's nice because it coincides with the movie, because the movie's all about … what happened during the space race," says Shia. "So it's nice, but it's also, you know -- not long ago this was enemy headquarters, ladies and gentlemen. I mean, we're an international movie, but we are like an American movie, you know? And for us to be here premiering it with an American band [Linkin Park] in the middle of Russia is kind of -- it's not kinda, it is historic."

Also starring Josh Duhamel, Tyrese Gibson, John Turturro, John Malkovich and Frances McDormand, 'Transformers: Dark of the Moon' opens nationwide in 3D and IMAX 3D on June 29, with advanced screenings in 3D beginning the night before at 9 p.m.