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.
The Krabby Patty secret formula is kept only for people who are loyal enough to hide it from evildoers such as Plankton. As told in "Friend or Foe", a pinch of chum is present in this formula. 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 "Plankton's Army," "Growth Spout," and "Krabby Road."
In "Plankton's Army," Squidward reveals that the secret formula can be found at Mr. Krab's house, under his mattress. In "The SpongeBob Movie: Sponge Out of Water" it is present in the safe in the Krusty Krab.
The secret formula plays an essential role in the plot lines for "The SpongeBob SquarePants Movie" and "The SpongeBob Movie: Sponge Out of Water". In these movies, Plankton devises numerous ways to steal the formula as he does in many episodes in the SpongeBob SquarePants 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.
- Eugene H. Krabs (The Original Krabby Patty)
- SpongeBob SquarePants (Jelly Patty and Pretty Patty)
- Pearl Krabs (The Kuddly Krab Patty)
- Carl (Synthetic Patty)
- Sheldon J. Plankton (Chum Patty & The Original Krabby Patty)