As originally aired, this season featured adventures with Superman, Batman and Robin, Wonder Woman, Aquaman, and the Wonder Twins, similar to those that had aired the previous season in The All-New Super Friends Hour. These episodes were later shown using the opening credits of the All-New Super Friends Hour in syndication. The second segment of this season was Challenge of the Superfriends, a 16-episode series that came the closest to the comic books. Not only did Challenge have the Justice League of America, it was the first official Super Friends series to feature DC supervillains from the comics, and this series had 13 of them together as a group called the Legion of Doom. It included Superman foes like Lex Luthor, Brainiac, the Toyman, and Bizarro, and Batman foes like the Riddler and the Scarecrow.