The Dump is a community recycling center in Bikini Bottom. It has appeared in six episodes of the series. The Dump was first seen in the episode Artist Unknown when Squidward visits Spongebob after Spongebob becomes depressed over not being a good artist. It reappears in Idiot Box when Squidward begins to imagine he is in a race in Spongebob and Patrick's box. The Dump would be a central part of the plot in The Lost Mattress, where Spongebob, Patrick, and Squidward must retrieve Mr. Krabs's money-filled mattress after they discard it in order to help Mr. Krabs's back problems. The Dump had a brief a cameo in Wigstruck. In Friend or Foe, the Dump would again be an essential part of the plot, providing the location for Mr. Krab and Plankton's business in their childhoods. After a four season absence, the Dump reappears in Lost in Bikini Bottom as one of the obstacles Spongebob must overcome to get back to the Krusty Krab. The Dump has a giant chain-linked fence, is shown to have a guard worm, and has a giant sign depicting: Dump.