It's 'Transformers' time -- watch our exclusive footage from the set! From thundering fighter planes and explosive sets to Shia LaBeouf, Megan Fox, Josh Duhamel and Tyrese Gibson, only ET's Mark Steines got to visit director Michael Bay's top-secret 'Transformers: Revenge of the Fallen' set in New Mexico to give you an unprecedented sneak peek at next summer's biggest movie!

Mark sizzles in the desert heat -- where he's right in the middle of the action, the stunts, and the explosives! Watch him bring you to the set, where six F-16 jets soar above him and where he interviews the star-studded cast!

"I would say this is the craziest action I've ever been a part of," Shia tells Mark. He later goes on to say, "Just pound-to-pound footage of the stuff we've seen back -- the content is massive!"

'Revenge of the Fallen' crash-lands into theaters June 26 '09 with the reunited cast of the original blockbuster, which saw mankind caught in the middle of battling Autobots and Decepticons from another galaxy. Up until now, the 'Transformers' sequel set has been off-limits, but only ET got complete access to the closed set on Holloman Air Force Base and White Sands Missile Range in New Mexico.