The Patty Caper: The Krabby Patty formula has been placed in a vault far away for safe keeping. When Mr. Krabs forgets the recipe, he gives SpongeBob the key to the vault and sends him on a train ride to retrieve the formula. But someone steals the key! It's a mystery-aboard-a-train story as SpongeBob tries to locate the culprit, and he does it with the unlikeliest of allies ... Plankton! Plankton's Regular: Plankton has a customer who loves his chum and eats at the Chum Bucket every day-and no one is more surprised than Plankton. Could this mean competition for the ...