The Jelly Patty looks exactly like a Krabby Patty. However there is an obvious difference, due to it containing Jellyfish jelly. There is also a blue version of the Jelly Patty that is made by Friend as a lure for SpongeBob.
During SpongeBob's lunch break, he spreads some jelly on a Krabby Patty. Fred is interested by the sandwich and wants jelly on his patty too, so SpongeBob gives him some and Fred loves it.
After Fred tells Mr. Krabs how much he likes SpongeBob's new recipe, Mr. Krabs makes it an item on the menu, but he starts bribing SpongeBob to catch more and more jellyfish from Jellyfish Fields until there are no more left in the entire city, except the elusive No Name.
Mr. Krabs then puts the jellyfish in a large jellyfish-milking factory, where the jellyfish experience horrible treatments just for the
jelly they are producing. No Name is angered by this and he later captures SpongeBob and transports him to the factory.
After confronting Mr. Krabs and tricking him to open up all the containment areas for the jellyfish, Mr. Krabs is attacked and agrees to get rid of the Jelly Patty.