A Megalodon shark and a giant octopus were frozen in mid-combat back during the Ice Age. Their Alaskan glacier melts; the two creatures revive; both immediately set about cutting a swath of destruction. The octopus dismembers a Japanese oil rig. The Megalodon goes all "Air Jaws", leaping from the water to bite a 747 out of the sky. The octopus swats planes with its tentacles. The shark chomps the Golden Gate Bridge. It's glorious, I tell you. Absolutely glorious!