

Marina decides to set up a rock group and enlists her friends. During rehearsals Sharko turns out to be a very bad musician and gets kicked out of the group. But with the involuntary help of Zig, he will reveal his true talent during the concert!
Marina dreams of sailing the sea, so Zig asks Bernie to build a cruise ship where all her friends can hop aboard! However, all awhile, Sharko believes this cruise vacation is another one of Zig's traps. When the boat is taking a dangerous course, Zig and Sharko are too busy bickering as always to save the day… who will come to the rescue?
Zig dresses up as a cute baby so that Marina takes care of him. But the mermaid is too busy and asks Sharko to babysit Zig! The shark develops strong paternal feelings towards the kid and is heartbroken when he finds out his true identity.