Dr. Gross is a supporting antagonist in the series Adventure Time, serving as the main antagonist of the Season 7 finale "Preboot/Reboot" and the posthumous overarching antagonist of the "Islands" miniseries. She is a seemingly helpful yet incredibly twisted doctor whom once taught the remaining humans on the island, before becoming obsessed with cybernetic enhancement. She now wishes to bring humanity into a golden age through robotic modification with her hybrid army. She herself is a cyborg.