Yeoman (then Lieutenant) Martha Landon was a 23rd century Starfleet operations division (later Security officer) crew member assigned to the USS Enterprise under the command of Captain James T. Kirk. While serving aboard the Enterprise, Landon was for a time romantically involved with Pavel Chekov.
In 2267, Landon was one of nine crewmembers assigned to the landing party that conducted a survey on Gamma Trianguli VI. Landon and Chekov's open display of affection angered the planet's natives because love and intimacy were forbidden on the planet by Vaal. If Marple was killed, then Landon was the only redshirt in the landing party to survive. (TOS: "The Apple")