The Jerktonium is a fictional element that appears in the episode "It's a SpongeBob Christmas!" and the online game of the same name.

Description and effects

Jerktonium is a green material that is known to change Bikini Bottomites into jerks when ingested. Infected victims develop big black eyebrows, black bags around their eyes, and a mass of black stubble around their mouths.

The only two known to be immune to Jerktonium is SpongeBob, due to his pure heart, small brain and innocent love of Christmas, and Squidward, humorously due to his complete lack of compassion and antisocial nature. The antidote to the effects of Jerktonium is the song "Don't Be a Jerk (It's Christmas)."

Role in series

"It's a SpongeBob Christmas!"

Plankton discovered the material and plans to use it on people in Bikini Bottom to make himself look good compared to them. His first victim to use it against is SpongeBob. He makes SpongeBob try the Jerktonium-laced fruitcake but it does not work on him making Plankton angrily gift the Jerkmaker-9000 to SpongeBob. Shortly after that, SpongeBob unknowingly gives fruitcakes contaminated with Jerktonium to everybody in Bikini Bottom after obtaining the Jerkmaker-9000 from Plankton.

Seeing that the Jerktonium works on other people in Bikini Bottom except SpongeBob, because of his innocent love of the holidays, Plankton constructs a robot known as ToyBob to wreak havoc in Bikini Bottom which ruins SpongeBob's reputation.

Later, SpongeBob realizes that people in Bikini Bottom are acting like jerks so he decides to ask Sandy for help. After getting help, SpongeBob sings the song "Don't Be a Jerk (It's Christmas)" to cure everyone, they join in. When Santa arrives around at the Krusty Krab, he prepares to give everyone except Plankton coal and gives Plankton the Krabby Patty secret formula from Mr. Krabs. Shortly after, ToyBob, arrives to wreak havoc, but SpongeBob defeats him with the Jerkmaker-9000 in time to save Bikini Bottom.

This causes Plankton's plan to get the Secret Formula to fail due to Santa identifying, from ToyBob's remains, that the robot actually belongs to Plankton himself. After that, Plankton is put back on the Naughty list, and everyone gets a present while Plankton surrenders the formula and gets a bag of coal tipped over his head.


  • In real life, there are no elements with a "J" on the periodic table.
  • Even though Plankton is said to have discovered Jerktonium, Sandy possesses knowledge of it as well.
  • It does not affect those who are pure of heart, as seen with SpongeBob. However, it is unknown what effect it has on those who are already cruel as Squidward didn’t seem affected.


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