Sheldon J. Plankton, from SpongeBob SquarePants, is well known and infamous for his obsession with obtaining the secret formula of a krabby patty (the Trademark Favorite Food of just about everyone) so he can finally put his former friend and rival Eugene H. Krabs out of business. But how has he attempted to get the formula throughout the years?
Season 1
- Plankton!: He mind controls SpongeBob into bringing him a Krabby Patty so he can analyze it.
- Culture Shock: He performs a magic act at the Krusty Krab talent show and attempts to make off with a patty.
- F.U.N.: He tricks SpongeBob into befriending him so he can steal a Krabby Patty.
- Walking Small: He tricks SpongeBob into chasing everyone away from the beach so he can use the land to build a new location.
Season 2
- Imitation Krabs: He creates a robot vessel modeled after Mr. Krabs, hoping to fool SpongeBob into thinking he is the real Eugene so the latter will give him the formula.
- Welcome to the Chum Bucket: He gets SpongeBob fired from the Krusty Krab and forcibly hires him at the Chum Bucket, hoping SpongeBob's incredible cooking abilities can get the Chum Bucket some customers.
- The Fry Cook Games: He hires Patrick, SpongeBob's best friend, in an attempt to beat SpongeBob and Krabs at the Fry Cook Games.
Season 3
- The Algae's Always Greener: He uses a reality-shifting remote to switch his and Eugene's lives so that Plankton can own the Krusty Krab.
- Krusty Krab Training Video: He steals a Krabby Patty, gives it mechanical legs, and tries to ride away on it during one of the training excercises.
- Plankton's Army: He invites all his relatives (a few thousand, he is a plankton after all) to help break into the Krusty Krab and steal the formula.
- The Sponge Who Could Fly: He requests SpongeBob spread the word of evil.
Season 4
- Fear of a Krabby Patty: He secretly forces SpongeBob to become an exhausted insomniac, and then tries to mentally break him into revealing the formula.
- Krabs vs. Plankton: He sues Krabs in court to take everything he owns, including the formula.
- Dunces and Dragons: His medieval ancestor enslaves a jellyfish dragon into destroying the castle of King Krabs and kidnapping his daughter, Princess Pearl.
- Enemy In-Law: He falls in love with Eugene's mother, and tries to marry her so that, as his step-father, he can force Eugene to give him the formula.
- New Leaf: He turns the Chum Bucket into a gift shop and acts nice so he can convince Krabs to give him the formula.
- Best Frenemies: He and Krabs team up to steal the Kelp Shake formula, then he betrays Krabs to have it to himself.
Season 5
- Friend or Foe: His past friendship with Krabs is revealed, where he and Krabs teamed up to make good food for the teenagers, but got into a fight when splitting up the business when it became popular.
- Spy Buddies: Angered at Patrick destroying the Chum Bucket, he sends a blimp to destroy the Krusty Krab.
- Krabs à la Mode: He sets the Krusty Krab's temperature to below freezing to drive away customers.
- Goo Goo Gas: He invents a gas that rapidly de-ages people, then attacks the Krusty Krab with it.
- Atlantis Squarepantis: He stows away on the Atlantean bus so that he can hijack the Atlantean weaponry and destroy the Krusty Krab.
- Mermaid Man vs. SpongeBob: He mind controls Mermaid Man and Barnacle Boy into attacking and destroying the Krusty Krab.
- 20,000 Patties Under the Sea: He becomes a mobile food salesman to drive more business to him and away from the Krusty Krab's mobile business.
- Banned in Bikini Bottom: He calls the cops on Krabs and SpongeBob for illegally reopening the Krusty Krab after it got shut down.
Season 6
- Krabby Road: He starts a band with SpongeBob, Squidward, and Patrick so that he can sneak off and get the formula late at night while they're all distracted playing music.
- Spongicus: He starts a gladiator colosseum, taking the Krusty Krab's business.
- Plankton's Regular: He tries to stop SpongeBob and Krabs from stealing away his only customer.
- Komputer Overload: He builds advanced robots made of normal objects (a water barrel, a toaster, a hair dryer, and a putt-putt golf windmill) and tries to storm the Krusty Krab.
- Chum Bucket Supreme: He hires Patrick as a slogan manager to drive in customers.
- Single Cell Anniversary: He tries to appease Karen so that she'll give him the formula, which is stored in her memory.
- Chum Caverns: He expands the Chum Bucket into the caves below and adds new items to the menu, attracting customers.
Season 7
- Tentacle-Vision: He crashes Squidward's show to advertise the Chum Bucket.
- Someone's in the Kitchen with Sandy: He steals and disguises himself in Sandy's skin, then tries to trick SpongeBob into teaching "Sandy" how to make a Krabby Patty.
- The Inside Job: He enters SpongeBob's brain and tries to find the formula in his memory.
- Greasy Buffoons: He uses the mass grease to make tasty chum, which attracts customers.
- SpongeBob's Last Stand: He plans to build a highway through Jellyfish Fields and on top of the Krusty Krab to put it out of business.
- Rodeo Daze: He tries to bomb the Krusty Krab.
- Gramma's Secret Recipe: He pretends to be SpongeBob's grandmother in order to trick the latter into telling him the formula.
- Welcome to the Bikini Bottom Triangle: He tries to steal the formula from Charles offscreen.
- The Great Patty Caper: He boards a train to steal the key to the Krusty Krab lockbox from SpongeBob.
- Buried in Time: He breaks into the Krusty Krab's time capsule to steal a copy of the formula that was inside.
- Shellback Shenanigans: He impersonates Gary in an attempt to find out the formula.
- Perfect Chemistry: He tries to convince Sandy to help him steal the formula.
Season 8
- Drive Thru: He tries to order a Krabby Patty from the drive through.
- Frozen Face-Off: He hosts a big sled race as a distraction while he steals the formula.
- Sweet and Sour Squid: He hires Squidward as a co-chef to attract business.
- Walking the Plankton: He boards the same cruise as Krabs and SpongeBob to steal the formula.
- Plankton's Good Eye: He tries to use his second eye to break into the safe.
- Fiasco!: He steals a plate containing patty and condiment residue, unaware it is an art piece.
