The California Coast is being hit by prehistoric sea creatures of gigantic proportions. Desperate to save human lives, the government is left with only one option: destroy the mega ton monstrosity dwelling on the ocean floor. Gargantuan! The world's last hope resides in a rogue group of naval aces led by tough guy Anchor Stevens. Plunging down into the darkest depths of the ocean in a super submarine, this daring team plans to infiltrate the hundred ton birthing machine and blow it to high hell. Can these super aces put this mean mother to rest and save humanity, or will Gargantuan and her deadly spawn reap global domination on humanity?