"Perhaps it's the head that I found in the lake!"
- Undersea Gal, during the Town Meeting
Undersea Gal is a female sea-creature citizen of Halloween Town. She has a green and scaly mermaid body, webbed hands, with fins on her head. She has yellow eyes and blue lips. Sometimes she is seen wearing an eye-mask while coming out of the water. She is often seen as a very grotesque creature, helping out the citizens of Halloween Town during their preparations for Christmas, and ultimately finds strange things inside of her lake, such as an unknown severed head. At the end of the movie, when Sandy Claws brings Christmas to Halloween Town, she is seen making a mermaid snow angel.