Sea serpent

A sea serpent is a mythological creature that lives in the ocean or a large body of water. The leviathan is sometimes referred to as a sea serpent.

Mainstream Smurfs Media
Sea serpents appear in mainstream Smurfs media. In "Smurfiplication" from the cartoon show, Gargamel went to get sea serpent slime for his experiments, only to come across a sea serpent from which the slime was secreted.