A theme park called Dragon Days has opened, and Frank, Joe, and Chet can't wait to get there. First they try their hand at a cool game called the Sword in the Stone. Whoever pulls out the blade becomes King for a Day. All hail King Chet—now he just has to deliver the sword to the Dragon Days sheriff to claim his crown. But suddenly a mysterious person in a black cloak steals the sword! Will they be able to catch the cloaked culprit in time for Chet to enjoy his prize?