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The fourth season of House premiered on September 25, 2007[4] and ended May 19, 2008.[4] Having previously fired Chase, and with Foreman and Cameron quitting, House starts a competition between forty applicants for the vacant positions.[5] He eventually narrows them down to seven, firing one each episode.[5] In the episode "Games", he fires Amber "Cutthroat Bitch" Volakis (Anne Dudek),[6] hiring Dr. Chris Taub (Peter Jacobson), Dr. Lawrence Kutner (Kal Penn) and Dr. Remy "Thirteen" Hadley (Olivia Wilde) as his new team.[7] Dr. Foreman rejoins the team after his dismissal from another hospital.[8] Meanwhile, Amber begins a relationship with Wilson.[6]

Interrupted by the 2007-2008 Writers Guild of America strike, the number of episodes was reduced to 16 instead of the planned 24.[9] Executive producer Katie Jacobs explained that it was hard for the writers to finish the story arcs started during the season with eight episodes fewer.[9] Season four also introduced seven actors to the cast; in addition to Jacobson, Penn and Wilde, who became regulars, Andy Comeau portrayed Travis Brennan, an epidemiologist;[10][11] Edi Gathegi played Jeffrey Cole, a geneticist;[12] Carmen Argenziano appeared as Henry Dobson, a former medical school admissions officer;[13] and Anne Dudek portrayed Amber "Cut-throat Bitch" Volakis, an interventional radiologist.[14] Each of the four departed the show after elimination, except for Volakis, who remained recurring until the finale, having started a relationship with Wilson.[15]