Oscar is a small fish whose big aspirations often get him into trouble. Meanwhile, Lenny is a great white shark with a surprising secret that no sea creature would guess: He's a vegetarian. When a lie turns Oscar into an improbable hero and Lenny becomes an outcast, the two form an unlikely friendship. When a son of a gangster shark boss is accidentally killed while on the hunt, his would-be prey and his vegetarian brother decide to use the incident to their own advantage.