1973's Super Friends' premise was for Superman to team up with other DC Comics superheroes (Aquaman, Batman and Robin, and Wonder Woman (Diana Prince) with her magic lasso, telepathy and invisible jet) along with eager young hero trainees Wendy, Marvin, and Wonder Dog for adventures. Their base of operation was called the Hall of Justice, where they responded to Trouble Alerts and information supplied by Col. Wilcox. Wendy demonstrated the brains, while Wonder Dog was similar to Hanna Barbera's Scooby Doo, and Marvin was enthusiastic but needed to learn the moral of each episode. The adventures were one hour long, and included occasional cameos by other heroes like Plastic Man and Flash (Barry Allen). Hanna Barbera artist Alex Toth did the character designs. This series was cancelled in 1975 after two seasons."Their mission: To fight Injustice. To right that which is wrong. And to serve all mankind!"