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 (at least, to the marine world) that sea creatures have rarely returned from. Can Spongebob and Patrick make it through the six-day limit to save Mr Krabs? They'll have to as Plankton has taken control of everyone in town except King Neptune and his daughter, Princess Mindy.