Remy Hadley is the real name of the doctor known as “Thirteen” in House, M.D. Olivia Wilde played the character, who joins House’s diagnostic team during the fourth season.
The nickname comes from Hadley’s number in a competition House uses to select new team members. The number remains associated with her even after her identity and medical history become known to the audience.
Thirteen is a talented physician who keeps personal information private. Her storyline includes Huntington’s disease, a hereditary neurological disorder, and the difficult question of whether she may eventually develop symptoms. That plot gives the character an unusually personal connection to diagnostic uncertainty.
Remy Hadley is sometimes confused with Amber Volakis, another doctor from the same selection process. Amber is played by Anne Dudek, while Hadley is played by Olivia Wilde. The nickname “Thirteen” identifies Hadley, not a separate character or formal medical rank.