The highly-anticipated Monster Burping Contest is threatened for all underwater creatures, when vengeful Barf joins forces with the dreaded sea monster Big Snot, to kidnap beloved teacher, The Maestro, and his new star-pupil, Corallina. Heroic contestants, Charlie Chapfin and Mucus, navigate treacherous waters and encounter even wilder sea monsters, in an attempt to rescue their friends and save the contest in the nick of time.