After SpongeBob's pet Gary starts biting everyone, a rumor spreads through town that he has a rare snail disease, and as the Snail Bite panic builds, everyone's zombie-like behavior leads to a manhunt for Gary.
Mr. Krabs decides to hold a dance competition to bring more customers to Krusty Krab, and while everyone gets out their dancing shoes, SpongeBob tries to help Patrick get ready for the competition.