Final four:

While the original team left House's direct supervision, they remained part of the show's world: Foreman eventually returned to the hospital to supervise House, while Chase and Cameron took positions in surgery and the ER.

The Cost of Rationality: "House's Head" and "Wilson's Heart" house_reviews, posts by tag: season 4 - LiveJournal

Somewhere in the hallway, Thirteen hesitated. Then she followed Kutner to the differential board.

An enthusiastic but reckless doctor known for his "out of the box" (and often dangerous) ideas.

The season begins with House working alone after firing Chase and losing Cameron and Foreman to resignation. Forced by Cuddy to hire a new team, House launches a reality-show-style competition with 40 applicants, assigning them numbers and eliminating them one by one through a series of "challenges" and medical cases.

Dubbed "Cutthroat Bitch" by House, Amber is a ruthless competitor who later becomes central to the season’s emotional climax.