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 version of the Krabby Patty.
Role in episode
They are available at the Flabby Patty Shack, which is a restaurant made 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.