When an Amateur Detective Convention gets overrun by zombies, Batman and Batgirl team up with Mystery Inc. to get to the bottom of the oddball apocalypse. Turns out, the ghastly ghouls are part of a fiendish plan to reveal the Dark Knight's true identity. Can Batgirl, Scooby, and the rest of the gang keep the Caped Crusader's greatest secret from falling into the hands of a criminal mastermind?