When Mr. Krabs gives SpongeBob the only key to the vault holding the Krabby Patty's secret recipe, SpongeBob and Patrick must keep it safe, until it is stolen by a passenger on their train.
Squidward reluctantly allows SpongeBob SquarePants and Patrick to join the Krusty Krab soccer team because they are both good, and SpongeBob learns about being a team player and good sportsmanship during a game.
When SpongeBob notices that the Krusty Krab sign has been ruined, he's off to find the culprit; because the sign's broken wood looks "karate chopped" his good friend Sandy Cheeks becomes his first suspect.