Dr. Marbles is a brilliant inventor who assists Motherboard, and is trying to restore her to her full power. He is always full of ideas and helps out the Cybersquad. In his solo quests to assist Motherboard, he usually doesn't get to finish them because of The Hacker, whom he created as an assistant to Motherboard originally. He is usually called "The Doc" by Digit, due to their partnership and friendship. Dr. Marbles first appears in the very first episode, "Lost My Marbles".