Sam Witwicky discovers something about the origins of the Transformers and their history on Earth. The evil Decepticons need to capture him for information. The climactic battle takes place at the Giza pyramid complex, where a temple is located within.
Transformers who visited Egypt before the pyramids were built, and "all heroes end up here because of the Decepticons' masterplan." Furthermore, Egyptian hieroglyphs resembling helicopters and other present day vehicles in real life will be explained as being depictions of those Ancient Cybertronians who visited Earth.