SpongeBob SquarePants Season 3 Episode 18 Missing Identity - Plankton's Army >At the 25th anniversary of Plankton's first attempt to steal the Krabby Patty secret formula, the entire Krusty Krab crew becomes alert. Plankton decides to enlist the help of all of his plankton relatives. Plankton successfully steals the formula, with his family's help, but is frightened after discovering the key ingredient; Plankton. This revelation causes Plankton and his family to flee in terror. However, Mr. Krabs reveals that the formula is a fake to trick Plankton.