Elizabeth T'Les Tucker was a female Human/Vulcan hybrid. She was created as a binary clone from the DNA of Charles Tucker III and T'Pol sometime in mid-2154 by the organization Terra Prime. She was the namesake of her paternal aunt Elizabeth Tucker and her maternal grandmother T'Les, both of whom had died in the previous two years.
Because of the method used to clone her, Tucker's genetic structure was not stable. Shortly after her existence was revealed by Terra Prime, Tucker became ill, and died at the approximate age of six months. Doctor Phlox initially believed that it was because humans and Vulcans were incapable of creating a child with a stable genetic structure. However, he later discovered that the cloning method used was flawed; in time it would be possible for a stable Human/Vulcan hybrid to be created. (ENT episodes: "Demons", "Terra Prime")