During a tunnel excavation, a group of workers discover a rock so solid and so durable that even their most powerful and expensive drill cannot break through. With further examination, they find some strange creature fossils that are unlike any dinosaur fossil they have come across. Leena Pierre, a young archaeologist woman, and Tim, her American partner are then called on the site to find out more details about these strange remains. Their intrusion in the cave also awakens Garuda, a mystical giant bird associated to old Thai folklore. Now, that Garuda is fully awakened and going on rampage, it is up to Leena, Tim and the military team leader to put Garuda back to sleep before it reaches the surface.