Doc is a human resistance fighter operating within the ruins of 2187 New York City. He lives in the subway tunnels beneath the city, a refuge for survivors opposing the tyrannical rule of Marcus Octavius. His designation suggests medical knowledge and skills, implying he provides care to the rebels and civilians in the underground community.

He holds a position of trust and leadership among the resistance. Doc is present during critical events, including Colin MacLeod's initial encounter with Dahlia's rebel group. He participates in strategic discussions and actions aimed at countering Octavius's forces and thwarting the planned release of a deadly virus. His interactions demonstrate his integration within the core group coordinating the rebellion.

Doc's role centers on his participation within this resistance cell during the film's events set in the 22nd century.