The SpongeBob-Plankton relationship is an interaction between SpongeBob SquarePants and Sheldon J. Plankton.

F.U.N 100


SpongeBob and Plankton have a love-hate relationship. When SpongeBob first met Plankton, he tries to befriend him, but as Plankton told him that he wants a Krabby Patty (and by extent, the formula) for his birthday, SpongeBob refuses. From that point on, whenever Plankton tries to steal the formula or a Krabby Patty, most of the time, SpongeBob tries to stop him. However, despite this, they have been friends a few times.

Episodes as enemies

  • "Plankton!:" Mr. Krabs tells SpongeBob to stay away from Plankton, as he tends to try to steal the formula. As Plankton tells SpongeBob of his ambitions, SpongeBob tells him that he will never get a Krabby Patty. Plankton then hijacks his brain and controls him to the Krusty Krab to get a Krabby Patty and haul it to the Chum Bucket. As SpongeBob is controlled into dropping it into the analyzer, he apologizes for his actions to describing the tasty qualities of the Krabby Patty, causing Plankton to exit him and attempt to gain the patty, only to be dropped into the analyzer. As SpongeBob leaves the Chum Bucket with the patty, Plankton yells at SpongeBob to come back with it.
  • "F.U.N." Plankton pretends to be in a friendship with SpongeBob as a scheme to get a Krabby Patty. Mr. Krabs warned SpongeBob about this, but SpongeBob wouldn't listen. Eventually, SpongeBob broke down in tears when he found out that Plankton was hiding a Krabby Patty. Plankton reveals that it was all a trick to get The Krabby Patty formula.
  • "Sleepy Time": Plankton, along with many others were angry at SpongeBob and demanded him to stay out of their dreams.
  • "Walking Small": Plankton manipulated SpongeBob into becoming assertive by telling him they were acts of kindness, causing everybody to leave the beach. Plankton later reveals that it was a trick to get everyone to leave so he could build another Chum Bucket. SpongeBob realized that Plankton took advantage of him, and does several acts of kindness, bringing everyone back, much to Plankton's disgust.
  • "Imitation Krabs": Plankton disguised himself as Robot Krabs as an attempt to get the secret formula. Plankton got outraged when SpongeBob made him do many ridiculous things and still wouldn't tell him the formula. SpongeBob later inserts a penny in the "self destruct" slot, realizing that it was Plankton and not Krabs.
  • Welcome to the Chum Bucket Mr. Krabs told SpongeBob he has to work for Plankton now because he lost a card game with Plankton and he mistakingly bet his contract. SpongeBob refuses and begs Krabs not to make him work for Plankton, but he was forced to. Plankton immediately threatened to put SpongeBob's brain in a robot version of him if he refused to obey his orders. SpongeBob was reluctant to make a Patty but tried making SpongeBob's job more comfortable by letting him have anything he wanted, including a grill and replica of The Krusty Krab kitchen. Even after, SpongeBob still refused to make a Krabby Patty for him and makes a bunch of selfish demands. Plankton gets fed up and he puts SpongeBob's brain in the robot, only for the robot to become bratty and refusing to make a patty. Plankton has had enough and pleads Krabs to take back SpongeBob.
  • The Fry Cook Games Plankton convinced Patrick that SpongeBob is not his friend and that he's evil, and forced him to fight SpongeBob.
  • Fear of a Krabby Patty Plankton made Mr. Krabs open his restaurant to 24 hours a day by making his restaurant open 23 hours a day, causing Spongebob to get overworked. He also puts an order of 10,000 Krabby Patties as an attempt to make him crack.
  • Krabs vs. Plankton": After Plankton faked an injury to get the formula, SpongeBob became the lawyer and proved to the jury that Plankton was faking it the get the formula.
  • Friend or Foe SpongeBob stopped Plankton from stealing the formula and later chases after him and Karen after Plankton stole the formula again.
  • Krabs a la Mode SpongeBob stopped Plankton for stealing a Krabby Patty, and Plankton also froze SpongeBob with the thermostat.
  • Goo Goo Gas: Plankton turned SpongeBob into a baby.
  • Mermaid Man vs. SpongeBob: SpongeBob ruined Plankton's plan by turning Mermaid Man and Barnacle Boy back to normal after Plankton hypnotized them.
  • Banned in Bikini Bottom: Plankton called the police on the secret Krusty Krab, which almost got SpongeBob arrested.
  • Krabby Road" Plankton pretends to be in a band with SpongeBob to get the secret formula. When going to a gig at The Krusty Krab SpongeBob found out it was a trick to get the formula and the police arrive after and arrest Plankton.
  • Spongicus: SpongeBob ruined Plankton's gladiator show by saving Patrick by the lion.
  • Plankton's Regular: SpongeBob does multiple attempts to get Nat to eat at The Krusty Krab instead of The Chum Bucket, and later breaks into The Chum Bucket with Mr. Krabs to get his secret formula.
  • The Krabby Kronicle: SpongeBob wrote a lie about Plankton in the newspaper, which got his restaurant shut down. Although SpongeBob only did this because Mr. Krabs ordered him to.
  • Greasy Buffoons SpongeBob called the health inspector on Plankton and Mr. Krabs for feeding people too much grease, and Krabs and Plankton shove SpongeBob in a trash can and throw him down a cliff.
  • SpongeBob's Last Stand: SpongeBob successfully stopped Plankton's Super Shelly Highway from getting built.
  • The Great Patty Caper: SpongeBob and Patrick chase Plankton and try to stop his train to get the key to the safety deposit box that has the secret formula.
  • The Other Patty: Plankton, along with Mr. Krabs was furious at SpongeBob and intended on harming him for making another burger restaurant to get them to work together.
  • It's a SpongeBob Christmas! Plankton gives SpongeBob his jerktonium fruit cake to turn him into a jerk. When that doesn't work, he makes an evil robot SpongeBob and frames him of doing all of its evil deeds, only for SpongeBob to destroy it at the end.
  • Salsa Imbecilicus He makes SpongeBob, along with everyone else as dumb as Patrick.
  • Mimic Madness: Plankton and Squidward planned to harm SpongeBob for copying them.
  • Bottle Burglars: After Plankton stole the formula, SpongeBob and Squidward try to get it back.
  • The SpongeBob SquarePants Movie: As Plankton frames Mr. Krabs for stealing King Neptune's crown, SpongeBob and Patrick tried to retrieve the crown. Plankton then hires Dennis to assassinate the two. SpongeBob is not aware of Plankton's schemes until Dennis accidentally tells them. During the climax, SpongeBob then confronts Plankton, only for Plankton to mind-control King Neptune. As SpongeBob lays defeated with Plankton mortifying him as a "stupid kid," he agrees with Plankton. However, he is motivated from his adventure and uses his Goofy Goober guitar to free everyone, and after being stomped on, Plankton gets arrested.

Episodes as friends

  • "F.U.N.:" As the townsfolk run him out of town, SpongeBob feels bad for Plankton and decides to befriend him. While he is reluctant at first, Karen tells him of the mission as to where Plankton changed his mind. Plankton refuses to join along with SpongeBob's jolliness at first but eventually agrees. Mr. Krabs sought sight of this. The next day, Plankton goes into the Krusty Krab for SpongeBob, but Mr. Krabs tries to tell SpongeBob that Plankton is not his friend. SpongeBob refuses to believe Mr. Krabs and leaves with Plankton, but after getting a Krabby Patty out of Plankton's pocket, SpongeBob languishes from this and begs Plankton the truth. Afterward, Plankton leaves with the patty, stating that being evil is too much fun.
  • "Walking Small:" Plankton gets SpongeBob to be more assertive, and SpongeBob listens to his advice which pleased Plankton.
  • "The Algae's Always Greener When Plankton switches lives with Mr. Krabs, he becomes SpongeBob's boss. SpongeBob gives him Krabby Patties for "Inspection" and Plankton gave SpongeBob a promotion. SpongeBob also prevented Mr. Krabs from stealing a Krabby Patty, which was his motive much like Planktons.
  • "Party Pooper Pants:" Plankton attends SpongeBob's house party.
  • "Band Geeks:" Like the rest of the Bikini Bottom Super Band sing "Sweet Victory," there is a scene where both SpongeBob and Plankton sing together.
  • "SpongeBob Meets the Strangler:" Plankton goes to two parties for SpongeBob.
  • "Bucket Sweet Bucket:" SpongeBob and Patrick volunteer to paint The Chum Bucket and rebuild it.
  • "Single Cell Anniversary:" SpongeBob helps Plankton give Karen the best anniversary gift.
  • "Plankton's Pet:" SpongeBob agrees to help Plankton find a pet, eventually finding Spot in the process. Soon, as Plankton loses Spot, SpongeBob agrees to help find him. As they search at the animal shelter, SpongeBob accidentally opens the pens. Plankton then thanks SpongeBob for helping him, and as they are about to get mauled, SpongeBob notices Spot hiding in Plankton's eye. As Spot saves them, SpongeBob is proud of this, with Plankton stating that he taught him everything he knows.
  • "One Coarse Meal" SpongeBob pities Plankton and tells him about Mr. Krabs' fear.
  • Sweet and Sour Squid:" SpongeBob tells Plankton how to impress Squidward.
  • The SpongeBob Movie: Sponge Out of Water: SpongeBob and Plankton team up to retrieve the Krabby Patty formula and battle Burger Beard.
  • "Plankton Gets the Boot:" SpongeBob happily allows Plankton to take residence in his house after the latter gets kicked out by Karen, and later tries to help him win back Karen's heart.
  • "Plankton Paranoia:" Since Mr. Krabs' mentally insane behavior is ruining the restaurant business, SpongeBob and the gang secretly team up with Plankton to help put it to a stop. To do that, they planned an anniversary party of when Plankton first tried to steal the secret formula, which turned out to be a success.
  • "Appointment TV:" Plankton forces SpongeBob to change some light bulbs at the Chum Bucket despite his objections. Later in the evening, he, along with Patrick, Squidward, Mr. Krabs, Larry, Sandy, Gary, and Mrs. Puff, saw how completely sad SpongeBob was when he missed the lost episode of Mermaid Man and Barnacle Boy and realized that he took advantage of his kindness. To make it up to him, he and the others put on a play in a recitation of the lost episode.
  • "Karen's Virus:" SpongeBob assisted Plankton in helping get a computer virus out of Karen.
  • "SpongeBob's Big Birthday Blowout:" Plankton helps Sandy and the others decorate SpongeBob's house for his birthday party. After he returns, SpongeBob finds the house destroyed and everyone asleep from the party planning. Nevertheless, SpongeBob is excited that his family and friends would do so much for him. SpongeBob lists Plankton and the other wonderful friends and how he's grateful to have them. When Patchy the Pirate arrives and sings the birthday song, Plankton along with everyone else wakes up and properly celebrates a happy birthday to SpongeBob.
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