Yeoman third class Tina Lawton was a female Human Starfleet enlisted crewmember in the 23rd century. She served in the sciences division aboard the USS Enterprise in 2266 under the command of Captain James T. Kirk, during the historic five-year mission. She was born in 2249.
In 2266, Yeoman Janice Rand introduced Lawton to Charlie Evans, a seventeen year-old boy whom the Enterprise was transporting to Earth Colony V. Rand had been made to feel uncomfortable by Charlie's affections, and introduced him to Tina in an effort to facilitate his association with a woman of his own age. Charlie rebuffed Tina, however, wanting to further pursue a relationship with Rand. Trying to explain his infatuation to Rand, he claimed that everybody on the ship looked like Tina to him.
Later, out of frustration with the Enterprise crew, Charlie utilized incredible psychokinetic abilities granted to him by the Thasians to transform Tina into an iguana after she inquired what was the matter with him.