8 pm House (Fox) | Part 1 of tonight’s two-hour series finale is a retrospective featuring interviews with the stars and producers, original content and other surprises. Then, in Part 2, directed by series creator David Shore, House’s treatment of a drug addict (played by James LeGros, Mercy) leads the doc to examine his own life and personal demons. Among other returning faces, Jennifer Morrison, Amber Tamblyn and Kal Penn reprise their roles as Drs. Cameron, Masters and Kutner, respectively.