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Dr. Z is a major character in the Mr. Driller series. He's a kind and supportive man and helps Susumu Hori and his friends and creates things. He created Holinger-Z. He has gray eyebrows, mustache, hair and brown eyes. His rival is Dr. Manhole, who was once his friend and assistant. He is voiced by Kazuya Nakai, he also provides the voices of Keel Sark and Kowars.