 This series marked the animation debut of Batman, his supporting cast and some of their classic enemies like Joker, Penguin, Riddler, Catwoman, Mr.Freeze, Scarecrow, Mad Hatter, and some villains exclusive to the series.The success of "The Superman/Aquaman Hour of Adventure" in 1967 had prompted Filmation to produce a Metamorpho pilot and begin development on other similar series.