Madame Hagfish is a old slime eel (hagfish) and the second antagonist in Legends of Bikini Bottom. She enters the Krusty Krab and spews slime in front of Squidward. Squidward refused to give her a krabby patty since these type of burgers have grown up in cost since she had been there before and Madame Hagfish only uses a couple of shells as money. She later puts a curse on the Krusty Krab. A curse shows no sign of any customers, plate falling without big thumps, and dollars on fire and teared apart shows it catches on fire again. She has alot of slime on her body that way she can suffocate her prey like regular hagfishes. SpongeBob and Krabs, both go to Madam Hagfish's magic wheel wagon house to tell her to put the curse away. To put the curse away out of the Krusty Krab, SpongeBob and Krabs are send to get her the golden doubloon that was stolen by the Giant Golden Eel. SpongeBob and Mr. Krabs enter in Golden Eel's cave and they see the eel sleeping. SpongeBob slips on the Eel's leftover pudding/green slime and the eel wakes up. The Giant Golden Eel grabs Mr. Krabs and starts to strangle him. Sponge touches the eel softly and the eel lets go Mr. Krabs and was touched softly by SpongeBob again and spits out the doubloon. Sponge and Krabs return and give the doubloon to Madame Hagfish and she puts the doubloon in the washing machine to clean her clothes. It shows that the Krusty Krab curse was a close sign that was standing for a long time. The "curse" is lifted and customers visit the Krusty Krab; however, the Giant Golden Eel appears again and goes on a rampage. She will only be seen in THE ADVENTURES OF GARY THE SNAIL MOVIE.
- Madame Hagfish somehow is acting like a sea witch like Ursula and Morgona.
- When Madame Hagfish said "This must be the most generous thing anyone has ever done!!", it was taken from Andrew Kinkonakis.
- Like real-life hagfish, Madame Hagfish secretes vast amounts of slime or mucus from her mouth and body.
- Madame Hagfish is based on a gypsy, from her clothing to her residence in a gypsy caravan. In movies, cartoons, and other shows, gypsies are often depicted as fortune-tellers or otherwise possessing supernatural powers. Even putting hexes or curses on those who have done them wrong.
- She could possibly parody Madam Zeroni from the book (and later a movie) Holes.
- Due to her appearence, she has frightened younger viewers.