A baby cloned by Terra Prime from the DNA of Trip Tucker and T'Pol, whom the two name after Tucker's late sister.
Elizabeth is a human-Vulcan child created by the anti-alien movement Terra Prime from DNA taken from Trip Tucker and T'Pol. In Demons, Phlox analyses a hair sample delivered by a dying woman and finds that it belongs to a child of the two officers, though T'Pol has never been pregnant.
In Terra Prime, John Frederick Paxton uses the baby as propaganda, claiming such hybrids threaten humanity. Tucker and T'Pol name her Elizabeth after Tucker's sister, who died in the Xindi attack on Earth. She dies soon after the crisis because of a flaw in Paxton's cloning process.