Alcatraz (8pm, Fox) - Two new back-to-back episodes close out the season tonight. In the episodes, Rebecca and Doc close in on a man who may be the key to understanding why the criminals are returning, and a discovery is made beneath the halls of the prison.
Finding Your Roots with Henry Louis Gates Jr. (9pm, UNC-TV) - Historian Henry Louis Gates Jr. helps two New Orleans natives -- Harry Connick Jr. and Branford Marsalis (who currently lives in Durham) -- trace their roots. In a second episode airing at 10, Newark, N.J., mayor Cory Booker and Georgia representative John Lewis are researched.
Being Human (9pm, Syfy) - Sally tries to fix a life that she ruined and Josh must choose between Nora and Julia.
Smash (10pm, NBC) - Derek plots to steal the musical and he wants Karen to assist him. Meanwhile, Eileen's daughter makes a surprise visit home and Ivy is uncertain about her future.
Castle (10pm, ABC) - Five people are killed in a bomb explosion at a protest rally, and Castle and Beckett try to uncover who planted the deadly device by focusing on the crucial seconds prior to the blast.
Brooklyn 11223 (11pm, Oxygen) - A new reality show built around a three-year feud between three best friends over whether one of the women had sex with her friend's then-boyfriend. Read Adrienne's review.