Það eru vandræði í uppsiglingu í Bikini Bottom. Einhver er búinn að stela kórónu Neptúnusar, og allt bendir til þess að yfirmaður Svamps Sveinssonar, Hr. Krabbi, sé sökudólgurinn. Þó að gengið hafi verið framhjá Svampi varðandi stöðuhækkun sem hann hafði lengi dreymt um, þá ákveður hann samt sem áður að standa þétt við hlið yfirmanns síns, og ásamt besta vini sínum Patrick, þá fer hann í hættuför til Skeljaborgar, til að finna kórónuna og bjarga lífi Hr. Krabba.
Deep down in the Pacific Ocean in the subterranean city of Bikini Bottom lives a square yellow sponge named SpongeBob SquarePants. SpongeBob lives in a pineapple with his pet snail, Gary, loves his job as a fry cook at the Krusty Krab, and has a knack for getting into all kinds of trouble without really trying. When he's not getting on the nerves of his cranky next door neighbor Squidward, SpongeBob can usually be found smack in the middle of all sorts of strange situations with his best buddy, the simple yet lovable starfish, Patrick, or his thrill-seeking surfer-girl squirrel pal, Sandy Cheeks.
Squid Girl has come to the land from the depths of the sea to conquer humanity in revenge for pollution of the ocean. Unfortunately she ruins the first house she uses as an invasion base and has to work to pay for repairs. Of course, she can't overcome the Aizawa sisters who manage the house, so who knows whether she can subjugate humankind.
