Challenge of the Superfriends is an American animated television series about a team of superheroes which ran from September 9, 1978, to December 23, 1978, on ABC. The complete series (16 episodes) was produced by Hanna-Barbera Productions and is based on the Justice League and associated comic book characters published by DC Comics and created by Julius Schwartz, Gardner Fox and Mike Sekowsky. It was the third series of Super Friends cartoons, following the original Super Friends in 1973 and The All-New Super Friends Hour in 1977. Format First segment 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. Second segment 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 (apart from one episode with Gentleman Jim Craddock and another featuring Black Manta), 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. The Legion of Doom dwelt in a murky swamp and launched their attacks for global conquest from a sinister-looking, swamp-based, mechanical, flying headquarters called the Hall of Doom (which resembled Darth Vader’s helmet) as a suitable contrast with the Superfriends' gleaming Hall of Justice. Every week, the Legion schemed to either get rid of or destroy the Superfriends so they could conquer the world. The Superfriends themselves consisted of 11 Justice League heroes. Thanks to the first segment alone being used with the Challenge of the Superfriends opening and confusing references to the show, it is often mistakenly believed that the first and second segments were two separate shows. Production background Early development When the Challenge of the Superfriends season was originally conceived, it was named "Battle of the Super Friends" and featured the introduction of Captain Marvel. The group that challenged the heroes was called the "League of Evil", led by Captain Marvel's nemesis Doctor Sivana. However, Filmation produced