Leap year only comes once every four years, and for most, an extra day on the calendar is a mild novelty. But for Calendar Man, it's a critical error in that which he holds most dear -- and now, Batman and the GCPD respond to a deadly hostage situation, but can they work together to stop Calendar Man before it's too late? And lastly, the Question -- with the help of a surprise guest star -- unmasks the mysterious villain Zero!