Which actress played Dr. Remy Hadley, known as Thirteen, in House M.D.?

Olivia Wilde played Dr. Remy Hadley, widely known by the nickname Thirteen, in House M.D.

Hadley joined House's diagnostic team during the fourth season after the hospital conducted a large competition to replace departing team members. Her nickname came from the numbered identification she used during that selection process, and it remained her most familiar name within the series.

The character was written as a talented physician with a guarded personality. Her storyline included her bisexuality, her relationship with Eric Foreman, and her diagnosis with Huntington's disease. These elements gave the character a longer arc than a typical case-of-the-week guest role.

Olivia Wilde appeared in House M.D. from 2007 through 2012, with a temporary departure before returning for the final season. She is also known for films such as Tron: Legacy and Rush, and later directed Booksmart, released in 2019. Jennifer Morrison, another House cast member, played Allison Cameron rather than Thirteen.