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If you've got an hour to kill, there are worse ways to spend it than watching "Hollywood Game Night" (9 p.m., NBC/Ch. 5).

Jane Lynch hosts what amounts to a bunch of celebrities playing a bunch of goofy parlor games. You're not going to grow any brain cells watching, but it's fun.

This week's celebrity guests are Rosie O'Donnell, Rocco DiSpirito, Constance Zimmer, Nate Berkus, Kevin O'Leary and "Weird Al" Yankovic.

Elsewhere on TV ...

"America's Got Talent" (7 p.m., NBC/Ch. 5): Marlon Wayans is a guest judge.

"The Bomb" (7 p.m., PBS/Ch. 7): The story of nuclear weapons, from the earliest A-bomb tests to their impact on global politics.

"Rizzoli & Isles" (7 and 9 p.m., TNT): A teenaged girl is murdered.

"Extreme Weight Loss" (8 p.m., ABC/Ch. 4): An obese former dancer is looking to get her groove back.

"Are You Smarter than a 5th Grader?" (7 p.m., Fox/Ch. 13): Jeff Foxworthy hosts.

"Zoo" (8 p.m., CBS/Ch. 2): Jackson, Jamie and Shaffer search for a chemistwho has evidence of Reiden Global's role in the growing animal problem.

"Knock Knock Live" (8 p.m., Fox/Ch. 13): Ryan Seacrest hosts.

"Proof" (8 and 10 p.m., TNT): A bizarre haunting at an old church is investigated.

"Pretty Little Liars" (9 p.m., ABC Family): After their latest run-in, tensions are at an all-time high between the PLLs and the town.

"Stitchers" (10 p.m., ABC Family): The team investigates when a psychic is killed.

"P.O.V." (11 p.m., PBS/Ch. 7): "Tea Time" chronicles five Chilean women who meet each month for tea and pastries — a tradition they've maintained for 60 years.

"Scream: The TV Series" (11 p.m., MTV): Emma learns a heartbreaking secret after a scandalous video leaks.

"Another Period" (11:30 p.m., Comedy Central): Charles Ponzi brings an exciting business opportunity.