Madame Hagfish is an old hagfish and the former secondary antagonist of the episode, "The Curse of the Hex."
She has a lavender eel-like body like a real hagfish. She has teal fins on the tip of her tail and her upper arm. Clothing-wise, she is seen with a tattered dark burgundy shawl tied in the front. On her upper body she has a bunch of warts throughout her whole face, pinkish-purple dried out lips, wrinkled under-eyes, a pair of glasses lined with a gold rim with gold hoop earrings, and has light blue lenses. Her hair is styled curled up into bunches and cone shaped on either side of her head. She also has a light green cloth bandana on top of her head.
She is nice to people who help her, but is not to those who don't.
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.