It contains pale beige chum, sandwiched in between a sesame seed bun.
Role in series
"Friend or Foe"
Plankton gives out Chumburgers to his fellow classmates along with Mr. Krabs and his Krabby Patties, in an attempt to see who has the better burger. When Plankton's classmates eat both of their burgers, they dislike the Chumburger but adore the Krabby Patty.
Plankton gives out free sample Chumburgers disguised as Krabby Patties in order to give customers food poisoning, with the intent of smearing the Krusty Krab's good name.
It reappears (albeit called "Chum Burger"), and it is one of the foods that can be made at the Chum Bucket. It needs one chum patty and bun in order to be made. It takes 2 hours to make, gives two happiness when collected, and gives one happiness when fed to a Bikini Bottomite.