Encyclopedia SpongeBobia
Encyclopedia SpongeBobia
Not to be confused with Incidental 3 or Incidental 5.

Incidental 21, also known as Incidental PM13, is an incidental character who first appears in the episode "Ripped Pants" while his production order debut was in "Squeaky Boots." He is classified as a "hotdog" type incidental.


He is a peach fish with brown fins and lips, big beady orange eyes with black pupils, and thin black feet. He wears a teal shirt.

Incidental PM13

A sketch of Incidental PM13's model pose.

He is a patty monster with a large long head pointing upwards. He also has indigo lips and fins and large yellow eyes.

Role in series

Incidental PM13 shoving Old Man Walker as a patty monster aside.

Incidental 21 is a very occasionally used incidental character in the series. He is usually seen very deep in crowds with other incidentals. He was a bit more common in the first three seasons and he has yet to have his own speaking role. He was firstly designed to be a Krusty Krab customer.

Major roles

"Krabby Patty Creature Feature"

In the scene where SpongeBob feeds the patty monsters chum at the Chum Bucket, Incidental PM13 shoves the patty monster Old Man Walker out of the way to eat an incoming glob of chum that was originally heading towards the elder.


He is one of the fish the Chum Bucket glove squeezes out of the bus.


Incidental 21 with Incidental 5's color palette in "Squeaky Boots."

  • He was oddly miscolored as Incidental 5 in his production order debut, "Squeaky Boots."
  • He and Incidental 18 are the only incidentals that were designed for "Squeaky Boots" that were not on the first row of the original incidental model sheet.