dealt with Aquaman's powers (Aquaman: "My ability to talk to fish is of no use to us, Wonder Woman!") as well as the level of violence compared to today's cartoons, as Wonder Woman and Aquaman look away while the Powerpuff Girls beat up the Legion of Doom, going so far as to set the Scarecrow on fire. Most notably was Bubbles' double entendre reply to Wonder Woman's compliment on how they were developing as superheroes. "Someday we'll be as developed as you." Lex Luthor, since he was a villain, began laughing. His allies understood the joke and all of them laughed as well. When a piece of the Hall of Doom's ceiling fell on Luthor's head, everyone laughed. In 2003, Cartoon Network Latin America aired the spoof series The Aquaman & Friends Action Hour that starred Aquaman as a children's television show host and the Legion of Doom as his bankrupt villains. Legends of the Superheroes The two NBC televised live-action specials of Legends of the Superheroes produced by Hanna-Barbera Productions was based largely on Challenge of the Superfriends while featuring Adam West, Burt Ward, and Frank Gorshin of the 1966 Batman television series fame (West would go on to voice Batman in SuperFriends: The Legendary Super Powers Show and The Super Powers Team: Galactic Guardians). The Justice League starred Batman, Robin, Captain Marvel, the Flash, Green Lantern, Hawkman, the Huntress, and the Black Canary against the Legion of Doom which featured Mordru leading Doctor Sivana, the Riddler, Giganta, Sinestro, the Weather Wizard, and Solomon Grundy (Superman, Wonder Woman, and their associate characters were absent due to the Superman film and Wonder Woman television series licensing the rights to them, respectively). DC Super Friends Despite using the main theme from The World's Greatest SuperFriends, the 2010 DC Super Friends "The Joker's Playhouse" shares several elements of its opening sequence with Challenge of the Superfriends, including introducing the Legion of Doom. Robot Chicken DC Comics Special The opening sequence of the Robot Chicken DC Comics Special parodies the opening of Challenge of the Superfriends with the Legion of Doom substituted for Robot Chicken original characters Chicken, Mad Scientist, Nerd, Humping Robot, Composite Santa, Gummy Bear, the Unicorn, and Bitch Puddin'. The Legion of Doom, Hall of Doom, and Hall of Justice also feature prominently in the episode. In popular culture In the video game DC Universe Online, if a player decides