Doctor Jeremy Lucas was a Human physician participating in the Interspecies Medical Exchange during the 2150s. Doctor Lucas was essentially the counterpart to Doctor Phlox; Lucas was assigned to a city on Denobula while Phlox went to Starfleet Command on Earth. The two maintained a long-distance friendship through the occasional subspace letter. In September 2151, Lucas mailed Phlox to tell him of his stress during the violent Denobulan mating season. Phlox reciprocated with a story about his new posting on Enterprise NX-01, specifically the outbreak of a plague on Valakis. (ENT: "Dear Doctor")