After King Neptune's crown is stolen, SpongeBob and Patrick go on a quest in 6 days to retrieve his crown. On the way SpongeBob and Patrick defeat many evildoers using their brains and bronzes. While this is happening someone is taking over Bikini Bottom and SpongeBob and Patrick must defeat this mastermind. There's trouble brewing in Bikini Bottom. Someone has stolen King Neptune's crown, and it looks like Mr. Krabs, SpongeBob's boss, is the culprit.
Though he has just been passed over for the promotion of his dreams, SpongeBob stands by his boss, and along with his best pal Patrick, sets out on a treacherous mission to Shell City to reclaim the crown and save Mr. Krabs' life. Trouble is brewing in Bikini Bottom. Plankton has stolen King Neptune's crown and has blamed it on Mr Krabs, Spongebob's boss. Spongebob is upset about being turned down for the promotion of his life, but forgives Mr Krabs and sets out to prevent his boss from being executed. However Neptune's crown is in the dreaded Shell City... a sinister place that sea creatures have rarely returned from.