If there's going to be a third “Transformers” movie, director Michael Bay says he'll be back to make it. And star Shia LaBeouf promises it'll be darker than the first two. Bay and LaBeouf talked about the prospects of another sequel Monday night at the Los Angeles premiere of the second installment, “Transformers: Revenge of the Fallen,” which opens Wednesday. While a third chapter has not been officially announced, Bay said he intends to return to the franchise if No. 3 moves forward. But he wants some time off first, having just finished the second one. “I will do it, but you've got to give us time,” Bay said. “I need a little rest.” LaBeouf said he expects a third “Transformers” would carry the action beyond Earth and become “more of an intergalactic thing.” “Revenge of the Fallen” takes place largely on Earth as LaBeouf, Megan Fox, Tyrese Gibson, John Turturro and other co-stars continue their alliance with the benevolent shape-shifting Autobots in their war against the evil Decepticon robots. A third movie also “will be darker. Something crazy will happen,” LaBeouf said. “Someone has to die.”