Ketchup is a condiment that is used frequently in SpongeBob SquarePants. This item is mainly used by SpongeBob after he has made Krabby Patties. Ketchup varies in different shapes and sizes as seen in "Krusty Krab Training Video" and "Little Yellow Book," where it's shown that the Krusty Krab carries ketchup packets. SpongeBob also used ketchup in his sundae in the episode, "Something Smells" where he actually squirted the entire bottle. The ketchup bottle is also unusually big in that episode as well. Ketchup is also seen twice in the much later episode "Eek! An Urchin" where SpongeBob spilled some on the floor and a customer poured some on the sea urchin.
Ketchup appears in SpongeBob Moves In! as a cooking material, it requires 2 tomatoes to be made, and takes 5 seconds to make it.
Ketchup is seen in many episodes when Krabby Patties are shown. Here are episodes that Ketchup appears in: