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Doctor Mark Mathias was a friend of Hex who worked in the same department. He was manipulated by Hex and Ace on 12 October 2021 after he was taken by the Cybermen. (AUDIO: The Harvest)

Hex later inquired about him during the 2025 London evacuation. Oracle informed Hex that Mark was infected with "the contagion", and transformed into a zombie. Hex had thought that he'd return for him, and that he and Mark would go for a drink at the White Rabbit like in the old days. (AUDIO: Project: Destiny)