Encyclopedia SpongeBobia
Encyclopedia SpongeBobia
At long last, I've acquired issue #2 of Wonder Space Fish, and in mint condition!
— Incidental 18, "Rule of Dumb"

Incidental 18 is a fish who first appears in the episode "Ripped Pants" while his production order debut was in "Squeaky Boots." He is classified as a "weirdo" type incidental.


He is a short, light olive green fish with red-orange dots and lips, orange eyes with black pupils, and thin black feet. He wears square shaped nerd glasses.

Role in series

Incidental 18 with his box of comics.

Incidental 18 has very few notable and speaking roles. There is currently only one episode where he speaks. He usually appears in crowds with other incidentals. He was firstly designed to be a Krusty Krab customer.

Major roles


He gasps when Bubble Bass reveals that there are no pickles on his Krabby Patty and when SpongeBob tells Bubble Bass "rawr."

"Squeaky Boots"

He and Fred look at Mr. Krabs with shocked expressions when they see him freak out.

"MuscleBob BuffPants"

Scooter tells him about how huge SpongeBob looks with his new Anchor Arms before Sandy asks them where SpongeBob is.

"New Student Starfish"

He appears as a student in SpongeBob and Patrick’s class in Mrs. Puff's Boating School where he laughs with the other students when Patrick says his name is 24.

"Mid-Life Crustacean"

He is seen playing ball with Incidental 151 and Incidental 102 where they accidentally send their ball towards Mr. Krabs and ask him for it back. Mr. Krabs asks if he can join them and then they tell him to keep the ball and refuse to play with him due to being too old.

"Rule of Dumb"

He has a comic book collection that he spent his whole life on which he wanted to show to his mother, but Patrick takes it away and Incidental 18 runs away crying.

"The Good Krabby Name"

He is part of the 2% of the population of Bikini Bottom who have never eaten at the Krusty Krab.


He is seen as one of the impatient customers forming a line at the Krusty Krab.

"Cuddle E. Hugs"

He is the second one to be devoured by Cuddle E. Hugs followed by Incidental 4.

"Upturn Girls"

He appears as one of the "lovely" customers at the Krusty Krab sitting with Incidental EHS9.


  • He is forty years old according to the episode "Rule of Dumb."
  • He and Incidental 21 are the only incidentals that were designed for "Squeaky Boots" that were not on the first row of the original incidental model sheet.