What2Watch Tonight

Tue, July 28

The Bomb

PBS, 8:00 pm ET

See how America developed the most destructive invention in human history — the nuclear bomb — and learn how it changed the world and continues to loom large in our lives. Hear from historians and those who experienced the dawn of the atomic age.


CBS, 8:00 pm ET

Gibbs (Mark Harmon) is surprised when a person who never really existed -- an alias devised for him when he worked undercover many years earlier -- "resurfaces," with the fake name attached to a murder victim, in "Blast From the Past." Given Gibbs' link to the situation, his NCIS team picks up the case. Michael Weatherly, David McCallum and Pauley Perrette also star.

America's Got Talent

NBC, 8:00 pm ET

Now that "I Can Do That" is over -- for this season, anyway (it'll be back) -- Marlon Wayans has time to be this show's latest guest judge in the new episode "Judge Cuts 3." He's given control of the Golden Buzzer, which he can use to send a contestant straight through to the upcoming live rounds at New York's Radio City Music Hall. Mel B, Heidi Klum, Howie Mandel and Howard Stern continue as the judging regulars. Nick Cannon is the host.

Are You Smarter Than a 5th Grader?

FOX, 8:00 pm ET
Are You Smarter Than a 5th Grader?

Two people from very different walks of life -- a Green Beret and a lawyer -- put their school skills to the test in the new episode "Christi/Shawn." As always with the adults on the show, they're posed the sorts of questions also used on elementary students ... several of whom just happen to be present in case their help is needed, as the players vie for $1 million. Host Jeff Foxworthy offers frequently amusing observations on the proceedings.

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