The Flabby Patty is a hamburger that contains light pink meat and lettuce on a sesame-seed bun. It is shown to be a rip-off of the Krabby Patty but they are shown to have a better taste and fresher smell than Krabby Patties.
Role in episode
They are sold at the Flabby Patty Shack, which was a restaurant created by SpongeBob in an attempt to get Mr. Krabs and Plankton to work together. The pair both want to steal the secret formula from the Flabby Patty due to its success.
At the end of the episode, they team up and successfully steal the Flabby Patty recipe. They read it and find out it is actually a recipe for friendship. SpongeBob reveals it was all set up so he could make Mr. Krabs and Plankton cooperate. After finding this out, they team up and chase SpongeBob.