inspired his regular insult, "skunkhead", which he often uses towards his more uptight brother. He also showed no qualm and in fact appeared to particularly enjoy himself wearing garb and open-toed sandals during the Roman Holiday adventure, which other boys from his modern time might have had gripes about, indicating he wouldn't have minded wearing such more often if he had the opportunity. Unlike Jules, Verne is quite popular at school and has many friends, including Marty McFly. Verne also developed a rivalry with Biff Tannen's son, Biff Jr. Biff Tannen (voiced by Thomas F. Wilson) – Biff is the great-grandson of Buford "Mad Dog" Tannen and is the present-day villain of the series, although most episodes feature his numerous ancestors or descendants instead (Marty once rhetorically questioned if there was a "Biff" in every time period and place they visited). In the series, Biff also has a son, Biff Jr. (voiced by Benji Gregory). During the first season, Biff would tell a joke after the end credits. Mary Steenburgen (Clara Clayton Brown) and Thomas F. Wilson (Biff Tannen) voiced their characters from the films. Christopher Lloyd played Doc Brown in the live-action segments which opened and closed each episode while Dan Castellaneta provided the animated Doc Brown's voice. James Tolkan, who previously portrayed Principal Strickland from the films, voiced an unnamed Civil Defense Warden in the episode "Marty Mcfly PFC". In addition, Bill Nye appeared as Dr. Brown's Lab Assistant during the live-action segments at the end of each episode performing scientific experiments related to the episode. Nye also serves as the show's technical advisor. These segments later led to Nye getting his own show. Episodes Series overview Season 1 (1991) Season 2 (1992) Home media Although the show no longer airs on television, nine VHS cassettes and three laserdisc volumes of the series were released from 1993 to 1994, chronicling 18 of the 26 episodes. The complete show was released on DVD on October 20, 2015 for the first time, both individually and as part of the Back to the Future: The Complete Adventures collection (which also includes all three films of the trilogy). In addition, the first episode from each season of the animated series (Brothers and Mac the Black) are included as bonus materials in the Back to the Future: 30th Anniversary Trilogy set. In 2016, Universal released an individual DVD of the show's first season