D'Marr was a humanoid trader and captain who lived in the 22nd century.

In 2151, he dined with Captain Jonathan Archer and T'Pol aboard the Enterprise (NX-01). He liked the coffee offered to him and attempted to give T'Pol some Triaxian silk. When asked about raw materials to fix the Enterprise, D'Marr gave coordinates to a planet where an abandoned Kantare vessel was located, and that no one salvaged it due to it being haunted. (ENT episode: "Oasis")

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