The gang is having fun with their old friends who are now a music group. They are ready to sing a new song based on an ancient voodoo chant but they also bring back a long dead ancient shaman who plans to turn them into zombies.

The gang go on a cruise, aboard the Sea Prowler, and come into contact with the Ghost of Captain Pescado, the Octopus Monster, and the Kelp Monster, after their professor disappears.