E.V.O.

The classic story of a young Megalodon who wakes up one day in a strange village/coral reef with amnesia.

What begins as a story of self-discovery and making lifelong friends soon turns into a life-and-death struggle against the evil Mammalius who has summoned a meteor to herald in the extinction of the lesser coldbloods.

At least that's my prediction of what the plot will be.