When arch-nemesis, Dr Blowhole kidnaps King Julien and threatens to melt the Arctic Circle, the Penguins have to stop him, but they walk into a clever trap.

Dr. Blowhole, the penguins' evil dolphin nemesis, returns to New York with a diabolical plan to turn them into creatures of destruction.

Doris the dolphin's quest to rescue her brother Francis from Seaville brings her to the lovestruck Kowalski.