Sitting on her rock, Marina the mermaid, is playing around with a sea turtle; on the beach, Zig, a famished hyena, sees the mermaid's body as a delicious fish steak; just as Zig swims off, he bumps smack into a huge shark.

Zig slaps a cannon together out of a magnifying glass, converting sunlight to a powerful laser beam; he inadvertently tries it on a gorilla, who jumps on the hyena; during the ensuing battle, the laser is accidentally aimed at the sea.

While off jogging, king Neptune spots the mermaid and falls head over heels in love with her; Marina is rather flattered, but as far as sharko is concerned, no way is that don Juan of the seas going to hang around his beloved mermaid.

An oil spill makes it difficult for Zig to catch Marina.

Sharko finds an old trunk full of gold coins; he builds himself a palace fit for a king and buys the entire island to seduce the mermaid; seems no one ever told him that money can't buy you love.

A snow storm hits the island and everything is frozen over; an ice floe forms in the lagoon, isolating marina's rock; since sharko is stuck in the ice, zig is home free in order to nab his mermaid.