In House, M.D., season four introduces Lawrence Kutner to House's diagnostic team.
Kutner is played by Kal Penn and joins the newly assembled team after House dismisses and tests a large group of applicants. The character is a sports-medicine specialist whose energetic, inventive approach often produces unconventional ideas during difficult cases.
Season four follows the rebuilding of House's department after the original fellows leave or change roles. Kutner becomes one of the selected doctors alongside Chris Taub and Remy Hadley, commonly known as Thirteen. Their recruitment gives the series a new team dynamic rather than simply restoring the earlier lineup.
Kutner is not introduced in season five, although his storyline has major consequences later in that season. Season three ends with the earlier team structure, while season six follows a different stage of House's professional and personal life.