A young yeoman third class aboard the Enterprise whom Janice Rand introduces to Charlie Evans as a companion of his own age, and whom he later transforms into an iguana.
Tina Lawton is a yeoman third class serving on the Enterprise in the first-season Original Series episode Charlie X. She was played by Patricia McNulty.
Charlie Evans, a seventeen-year-old raised without human company, becomes infatuated with Yeoman Janice Rand. Hoping to steer him towards someone nearer his own age, Rand introduces him to Tina in the recreation room. Charlie brushes her aside rudely and tells Rand that Tina is not the one he wants.
Once Charlie has taken over the ship with the powers given to him by the Thasians, he lashes out at the crew he meets in the corridors, and Tina is changed into an iguana. She is returned to normal with the rest of his victims when the Thasians arrive to take him back.