The Joker has a wave of twelve crimes planned, one for each sign of the Zodiac. With help from another of Gotham City's arch criminals, the Penguin, he successfully pulls off several of his capers. Batman and Robin suspect he will strike next at the Gotham City Museum and lay a trap for him there. But when they instead are captured by the Joker, it appears the Dynamic Duo will face doom as the villain prepares to crush them beneath a giant meteorite.
—Twenty Penguins