Doctor Plant was a doctor at St. Katherine's.
Plant treated Skinner after he was knocked out during a boxing match, but only determined he was knocked out, and that he had a bruise on his torso. He was later approached by Scully who asked him to ask about his poisoning. The doctor cooperated and together they worked on the virus in his blood sample. He was surprised that a lot of Carbon got into Skinner's bloodstream. When Skinner was severely inured by the virus he backed up Scully's interruption of Doctor Katrina Cabrera when she treated Skinner. (TXF: "The Beginning")