Kelpo is a brand of cereal that appears in many episodes, beginning with "Karate Choppers."
It is packaged in a small, light yellow box that depicts an image of a piece of kelp with a face, named Kelpy. The cereal's name is written at the top in dark blue, capitalized text, and also reads "with one of 8 essential prizes inside!" on an orange burst effect. There are squiggly lines on the side of the box, along with a blue square.
Role in series
Kelpo appears quite frequently throughout the series and is a highly recognizable brand of cereal sold in Bikini Bottom.
Mr. Krabs tries looking for a substantial amount of food in Bikini Bottom to feed to Pearl while she is having a growth spurt. He breaks into Patrick's house at night and steals his bowl of Kelpo while he is sleeping.