Pig's father was a brilliant inventor who created a damn that has kept the inhabitants of Sunrise Valley safe from the encroaching fog beyond it's borders. Then Pig's father walked into the fog and was never seen again, leaving Pig in charge of protecting the valley. And when an overpowering black fog threatens his community, Pig along with his friends Fox and Hippo, are determined to keep everyone safe even if it means stepping out into the fog themselves.