WATCH THIS:

  • "NCIS" (8 p.m., CBS): Television's most popular drama, which usually goes out on a suspenseful note, instead ends its season with an emotional one. The episode is a tribute to the late Ralph Waite, who played Gibbs' (Mark Harmon) father.

  • "Glee" (8 p.m., Fox): The Season 5 finale opens with everyone at a crossroads as Rachel (Lea Michele) ponders leaving Broadway behind to try out television. Our advice? Don't do it, Rachel!

  • "Frontline: The United States of Secrets" (9 p.m., PBS): This two-part installment explores the history of the massive National Security Agency surveillance program that started after Sept. 11. Included: how the U.S. government came to monitor the communications of millions of Americans and to collect billions of records on ordinary people around the world.

    Also on Tuesday:

  • "The Voice" (8 p.m., NBC)

  • "The Originals," Season finale (8 p.m., The CW)

  • "Marvel's Agents of S.H.I.E.L.D.," Season finale (8 p.m., ABC)

  • "Coming Back With Wes Moore" (8 p.m., PBS)

  • "The Goldbergs," Season finale (9 p.m., ABC)

  • "About a Boy" (9 p.m., NBC)

  • "Riot," Season premiere (9 p.m., Fox)

  • "NCIS: Los Angeles," Season finale (9 p.m., CBS)

  • "Trophy Wife" (9:30 p.m., ABC)

  • "Person of Interest," Season finale (10 p.m., CBS)

  • "Chicago Fire," Season finale (10 p.m., NBC)

    Contact Chuck Barney at Facebook.com/BayAreaNewsGroup.ChuckBarney, or Twitter.com/chuckbarney