A yeoman in the landing party that explores the seemingly idyllic planet Gamma Trianguli VI, whose romance with Ensign Chekov unwittingly gives the planet's sheltered people an example to copy.
Yeoman Martha Landon serves on the Enterprise in the second-season Original Series episode The Apple, where she was played by Celeste Yarnall.
She beams down with Kirk's party to survey Gamma Trianguli VI, a garden world that proves lethal: poisonous plants, explosive rocks and directed lightning kill several of the security men. Landon is shaken by the deaths and turns to Chekov for comfort, and the two are plainly a couple.
Their kiss is watched by two of the planet's inhabitants, who have never seen such a thing, and the imitation that follows angers the machine Vaal. When the villagers are sent to kill the landing party, Landon defends herself capably in the fight. She survives to return to the ship with Chekov.