Incidental K1 [1] is a kid fish who first appears as the secondary antagonist of the episode "Friend or Foe."



He is a light purple fish with purple fins, faded-blue lips, and wears a red shirt and a white and blue cap.


He likes to bully innocents with no apparent reason behind his actions, as seen in the flashbacks from his grade-school years and when he is shown as a delinquent teenager using ketchup as a weapon.

Role in series

"Friend or Foe"

He is shown as the leader of a group of class bullies at Poseidon Elementary School who constantly makes fun of Mr. Krabs about his clothes and calls him "Rag Boy" and also bullies Plankton for his small size and brilliant intelligence.

"Picture Day"

He is among a small mob of troublemaking teenagers who run rampant through Bikini Bottom, attacking people with ketchup.

"Penny Foolish"

He is seen in his mom's car, commenting over Mr. Krabs blabbering in his car. Additionally, his name is revealed in this episode when his mother says, "Billy, mommy's watching the road right now."

Picture Day Disaster

He appears on the title screen.

"The Clash of Triton"

He appears as a baseball player at the baseball field.

Nicktoons MLB

He appears in the Bikini Bottom field.

"Don't Look Now"

He is one of the kids who stars in the horror film Fisherman 4: Attack of the Hook.

"Lost and Found"

He is seen running away from school after hearing Squidward's kazoo playing in a flashback.

"Whale Watching"

He appears in Dylan's surface party.

"Stormy Weather"

SpongeBob gives him his leaf blower.


  • He is the first child bully to be shown in the series.
  • Despite being a teenager in "Picture Day," he does not look nor sound any different than he does as a first grader in "Friend or Foe."


  1. ^ Friend or Foe storyboard
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