Wendy, Marvin and Wonder Dog then appeared in the first nine issues of the "Super Friends" comic book series (November 1976 to December 1977). In issue #7 (Oct 1977), their on-screen replacements, the Wonder Twins, were introduced in a story called "The Warning of the Wonder Twins!" The cover showed the new characters literally pushing the old trio to the side, shouting, "Your time is past, kids -- this is a job for the "new" Super-Friends!" The three-part adventure ended in issue #9, with Wendy, Marvin and Wonder Dog retiring from the team to go to college, as the Wonder Twins are accepted as new members of the team.