Friday’s Highlights: 'Nikita' on KTLA
Who Do You Think You Are? Chef Paula Deen investigates her family history in the season finale (8 p.m. NBC).
Shark Tank: The Sharks all want a piece of a residential lock business started by the man who incorporated the common key into a mobile phone and business that Mark and Daymond backed in the third season gets a celebrity endorsement in the season finale (8 p.m. ABC).
Grimm: A series of grisly murders has Nick and Hank (David Giuntoli, Russell Hornsby) intensifying their search for the gold coins when a mysterious woman (Mary Elizabeth Mastrantonio) gets in the way in the season finale (9 p.m. NBC).
Supernatural: The season finale finds Sam and Dean (Jared Padalecki, Jensen Ackles) facing their most formidable enemy ever: Dick Roman (James Patrick Stuart) (9 p.m. KTLA).
Finding Your Roots With Henry Louis Gates Jr.: John Legend, Wanda Sykes and Dr. Gates’ friend Margarett Cooper learn about their free black ancestors (9 p.m. KOCE).
Whale Wars: Viking Shores: Capt. Watson deploys a new ultralightweight aircraft (9 p.m. Animal Planet). Then, in the season finale at 10 p.m. the crew of the Brigitte Bardot locates a pod of 100 whales just miles offshore — headed straight for the coast and a notorious hunting bay.
Magic City: Danny (Christian Cooke) confronts Stevie (Steven Strait) about his affair with Lily (Jessica Marais) and uses Klein (Matt Ross) to expose the blackmailer. Kelly Lynch and Jeffrey Dean Morgan also star (10 p.m. Starz).
Baseball: The Chicago White Sox visit the Chicago Cubs (11:10 a.m. WGN A); he Angels visit the San Diego Padres (7 p.m. FSN); the St. Louis Cardinals visit the Dodgers (7 p.m. FS Prime).
College softball: NCAA Regionals: Kentucky vs. Michigan (1:30 p.m. ESPN2); Louisville vs. Valparaiso (4 p.m. ESPN2).
Basketball: NBA Playoffs: The Boston Celtics visit the Philadelphia 76ers (5 p.m. ESPN); the Oklahoma City Thunder visit the Lakers (7:30 p.m. ESPN).
Women’s basketball: The Sparks visit the Seattle Storm (7 p.m. KDOC).
Photo: Ben Mark Holzberg / The CW