Miss Shell was SpongeBob's Kindergarten teacher. She is first seen in the episode: Party Pooper Pants where Fred sees his Kindergarten class picture and SpongeBob was the only sponge in Miss Shell's class. Two of her other students are Dennis and Fred. She was also seen in previous and other episodes after Party Pooper Pants as an old woman who is just a plain citizen. She made a second appearance in Mid-Life Crustacean. She also appeared on Wigstruck, but with a different outfit. In Neptune's Spatula, she said "Holy Smokes" in a deep voice and she has visible eyes and in Fools in April, SpongeBob was showing her where to find the forks. In Ghost Host, The Flying Dutchman tries to scare her. In some episodes such as The Bully, she is also seen as SpongeBob's classmate in Boating School. In All that Glitters, she smiled and stared at SpongeBob as he walks into the Krusty Krab naked. She also appears in the game Operation Krabby Patty where she was yellow in colour.
Miss Shell is an old purple fish who wears a blue dress and has gray hair. In Party Pooper Pants Miss Shell is yellow with teal hair.
 Known Students She Had
- Party Pooper Pants
- Mid-Life Crustacean
- Band Geeks
- Neptune's Spatula
- Fools in April
- Ghost Host
- Mermaid Man and Barnacle Boy VI: The Motion Picture
- Atlantis SquarePantis
- The Main Drain
- "Excuse me, where's the forks?" (Fools in April)
- "Holy Smokes!" (Neptune's Spatula)
- "Oh, Penny!" (Selling Out)
- Miss Shell also attended SpongeBob’s party but she looks a lot different.
- She thinks toothpaste is new.
- She is in Diner Dash 2 as a customer, but is called Yellowfin Croaker, not Miss Shell.