Mickey, Donald, and Goofy receive a call from Daisy saying that someone is consteantly playing dangerous pranks all over the ship. But since they are too busy with their other work, Mickey sends the rookies, Brandi Civine, Paws Crumpster, Max Goof, Huey, Dewey and Louie, to solve the mystery before somebody gets hurt as their very first case. So far for a beginning, the rookies come up with nine suspects: Thuraya Stunnington, Drizella Tremaine, the three little wolves, Princess Bambina, Mary-Lou Kimball, Martha Anne, Sawyer, Pain and Panic, and Danica Pasternack. After cleaning up after various pranks and finding various clues, the rookie team searches through the suspects' room and then trap her/him/them under the Walt Disney Theater stage behind bars.