A Japanese woman exploring the forest around Mt. Fuji falls into a crevasse and finds herself amidst some frozen dinosaur eggs that were in hibernation for millions of years. Coincidently, this is the moment one of them hatches and she barely escapes with her life. News of her discovery spreads and it is determined by scientists that dinosaurs are reawakening. There's quite a bit of talking, always a bit surreal when you're watching a badly dubbed Japanese movie, but the climactic battle between a giant plesiosaur and a pteranodon makes it all worthwhile.