 This led to the creation of Wendy, Marvin and their hero pet Wonder Dog, who appeared alongside their more famous friends.Because of the success of the "Super Friends" cartoon, a "Super Friends" comic book was also created, in which the trio made their first comics appearance.Wendy, Marvin and Wonder Dog didn't have superpowers, so often they didn't add much to the story progression, and they were dropped after the show's first season.