DC's greatest imaginary stories featuring Batman and Robin

In the 1960s, the heyday of DC's alternate reality 'imaginary' stories, a series of stories introduced a new Dynamic Duo made its debut, with Richard Grayson, the former Robin, as the new Batman. At his side was a new Robin: Bruce Wayne Jr. These are the stories of Batman II and Robin II, in which they battle the son of The Joker and meet Batwoman II and her sidekick, Batgirl.