Molly Stewart is Dex's adoptive Earth sister. Molly always tries to steer Dex in the right direction and help him adjust to life on Earth. Since his arrival, they develop a strong sibling relationship. Dex, in turn, always supports Molly to the best of his ability. In one episode, Molly tried out for the cheerleading squad and made the cut, though her career as a high school cheerleader is never mentioned afterwards.