Which actress played the diagnostician known as Thirteen in House M.D.?

Olivia Wilde played the diagnostician known as Thirteen in House M.D.

Thirteen's real name was Remy Hadley, and she joined House's diagnostic team during the fourth season. The nickname came from her number among the applicants competing for places on House's newly rebuilt team. Her character was a capable physician whose personal life included a family history of Huntington's disease.

Thirteen's uncertainty about whether she carried the disease became a major emotional storyline. The show used that plot to explore genetic testing, medical ethics, uncertainty, and the psychological burden of a possible inherited illness.

Wilde was already appearing in other television and film projects during her House M.D. run. The character is commonly identified by “Thirteen,” although “Remy Hadley” is her formal name in the series.