Animated TV series Camp Lakebottom follows the adventures of McGee, Gretchen and Squirt, a trio of kids who’ve been sent to the unusual summer camp of the title, where various supernatural and mythical creatures are the norm.
In the episode “McGee and the Mermaid”, the trio perchance encounter a mermaid named Esmeralda. She’s dried out from being kept in a trunk, and asks to be brought to the lake. The trio miss the cracks in Esmeralda’s sweet facade, and once the mermaid has been placed safely in water she reveals her true nature: she’s a powerful maniac who wants to flood everything and conquer the world. It’s up the the kids to stop her and save the day.