The Krabby Patty secret formula is a central ingredient to the highly popular Krabby Patty. There are many variations of the Krabby Patty but all have one secret ingredient which is yet to be identified or revealed. Plankton commonly tries to steal this formula in order to improve the popularity of the Chum Bucket but he fails every single time.
The Krabby Patty secret formula is written in ink on a paper and kept in a transparent blue glass bottle with a cork on top to keep its opening secure. The Krabby Patty secret formula is kept only for people who are loyal enough to hide it from evildoers such as Plankton.
For the full ingredients of a Krabby Patty, see here.
The Krabby Patty contains both the top bun and the bottom bun, with the top bun containing sesame seeds. It also contains sea cheese, sea lettuce, sea tomato, pickles, ketchup, mustard, mayonnaise, and sea onions, all of which can be seen when a Krabby Patty is being made (and as well correlate to the ingredients that can be found in normal burgers). As well as all of those ingredients is the patty and secret sauce, both of which have unknown ingredients, particularly the patty.
As told in "Friend or Foe," a pinch of chum is present in this formula, however, as it was revealed in a story that was made up by Plankton, it's possible that it isn't in the formula at all. In "The Great Patty Caper," some other ingredients were revealed: flour, barnacle shavings, salt, and turmeric. Another confirmed ingredient is love, which is revealed in the episodes, "Plankton's Army," "Growth Spout," and The SpongeBob Movie: Sponge Out of Water.
The patty and the other secret ingredients are of the most point of interest. Since there is no mention of where the patty might have come from nor was there very little mention of some of the things that are also in a Krabby Patty, the ingredients of the patty and other secret ingredients of the Krabby Patty remain a mystery.
Role in series
A running gag throughout the series is Plankton's many attempts to obtain the Krabby Patty formula as a means to attract customers to his restaurant, the Chum Bucket, usually through disguise and deceit. All of said attempts have failed, usually ending with Mr. Krabs throwing him back to the Chum Bucket or snatching the bottle out of his hands.
The secret formula plays an essential role in the plot lines for the twomovies. In these movies, Plankton devises numerous ways to steal the formula as he does in many episodes in the series. In the second movie, it is Burger-Beard the Pirate who attempts and succeeds to steal the secret formula in order to set up his own fast-food business on land.