 Wendy and Marvin were replaced in the 1977 series "The All-New Super Friends Hour" with the Wonder Twins -- extraterrestrial twins with the power to transform into animals and water.Wonder Dog's comedy relief role was filled by the Wonder Twins' pet monkey, Gleek.Wendy's voice was played by Sherry Alberoni, and Marvin and Wonder Dog were voiced by Frank Welker.