The characters were introduced to comics in issue #7 of the "Super Friends" tie-in series (cover-dated October 1977, but published in July 1977), by E. Nelson Bridwell and Ramona Fradon. The "Super Friends" comic book provided considerably more details of the Wonder Twins' background and how they came to join the team than was provided in the television series. Because of the different production lag times between animation and comics, the first comic book appearance is chronologically before the first television appearance.