Fiber, or dietary fiber, is a material in foods which assists the digestive system in digesting food and other materials.
It is seen in the episode "Mermaid Man vs. SpongeBob," when SpongeBob tried to end Plankton's mind control over Mermaid Man and Barnacle Boy. SpongeBob managed to get the controlled minions to consume the Krabby Patties, but the two weren't able to digest it until SpongeBob brought a concrete mixer filled with fiber and fed it to them, making them snap out of mind control.
|Title||Role(s) in episode|
|"Mermaid Man vs. SpongeBob" (tr)||Debut|
|"Penny Foolish" (tr)||Cameo|