Crisis On Infinite Earths: 36 Easter Eggs, Cameos And References You Probably Missed

Conroy's performance as The Dark Knight may have been a direct reference to Batman: The Animated Series, but everything else about his appearance paid homage to a different animated Batman show.

A grumpy old Bruce living in derelict castle with a much younger ward? The fact that it took place on Earth-99? Heck, even Kate's paragon nickname ('The Bat of The Future')? All clear references to the classic 1999 animated show Batman Beyond (or, as it was known in the UK: Batman Of The Future).