The Mermaids are mythical creatures from the episode, Welcome To The Bikini Bottom Triangle. It appears there are 5 mermaids, similar to Mindy. They first appeared as antagonists, as they stole many objects from Bikini Bottom. Their reason for stealing the objects was so they could find something "cool" to where. When they sung their song backwards, it returned the enormous pile of the stolen objects back to Bikini Bottom. They then decided to go to the mall with Pearl, because they wanted to find out what a mall was. Patrick had a crush on the Mermaids. Unlike Mindy, the mermaids looked confused seeing Patrick, when he was going to hang out with them.
- Like Mindy, Patrick had a crush on them. Apparently, Patrick likes mermaids
- They are also seen in the cover of Legends of Bikini Bottom where SpongeBob is in the main drain and Madame Hagfish attacks them with Ma Angler, except Old Man Jenkins and Gary.
- They resemble King Triton's daughters from The Little Mermaid except instead of 7 mermaids there are only 5 mermaids.
- SpongeBob and Patrick also went into a cave where they found a picture of a Mermaid, Madame Hagfish, and Ma Angler on the cave walls.