Mermaid Man and Barnacle Boy decide to have lunch at the Krusty Krab. Learning this, Spongebob becomes overexcited and runs for an autograph, prompting the heroes to flee in fear and in the process, Mermaid Man drops his utility belt, which includes many features including a shrinking button, which Spongebob inadvertantly uses to shrink everyone in Bikini Bottom./Spongebob is in the process of failing his driving exam (yet again), and while they plunge off an unfinished bridge, Mrs. Puff imagines many outcomes of the event, one of which is going to jail.。到了这个时候，剩下的人才开始猜疑，是不是有什么海底的未知生物，在他们没发觉的时候，偷偷爬上了他们的游轮，正趁着他们不注意提防的时候，将他们拖走吃掉。……