When The Joker breaks out of jail, the underworld throws a party for his escape, complete with giant greeting cards. Drawing inspiration, The Joker commits a series of crimes wherein he sends Batman cryptic greeting cards giving the Caped Crusader clues as to what he intends to rob. This eventually works against him, and Batman captures The Joker once more. Batman infiltrates the Gotham Prison to break down a large network of criminals working from inside. Professor Carter Nichols wants to learn about a man named Batman in the 15th century, and he sends Bruce Wayne and Dick Grayson back in time. The Dynamic Duo meet with Leonardo da Vinci, and they help him fight the oppression inflicted by a cruel ruler. On this mission, the great inventor uses his flying machine, which resembles a bat, and he escapes the dreadful place along with Batman and Robin.