The Best Episodes of Late Show with David Letterman Season 20

Comic Kathy Griffin; from "Zero Dark Thirty", actor Chris Pratt; Big Boi performs.

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TV personality Regis Philbin; musical guest Zedd.

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From "30 Rock", actor Tracy Morgan; sportscaster Marv Albert; musical guests Everest.

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Talk show host Michael Strahan; from "Zero Dark Thirty", actress Jessica Chastain; musical guest Conor Maynard.

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News anchor Brian Williams; musical guest Morrissey.

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From "Gangster Squad", actor Josh Brolin; from "Zero Dark Thirty", director Kathryn Bigelow; musical guest Ray Wylie Hubbard.

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Actor Michael J. Fox; from "Girls", actress Lena Dunham.

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From "Broken City", actress Catherine Zeta-Jones; from "Girls", actress Allison Williams; musical guests Jon Spencer Blues Explosion.

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From "Anger Management", actor Charlie Sheen; CBS Sports commentator and former NFL quarterback Phil Simms; musical guest José James.

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Actress Jennifer Lawrence; author Alan Zweibel; musical guest A$AP Rocky.

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Reality TV personalities Kim & Kourtney Kardashian; musical guest Buddy Guy.

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From "Hansel & Gretel: Witch Hunters", actor Jeremy Renner; animal expert Jack Hanna.

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From "The Following", actor Kevin Bacon; comic Brian Kiley; musical guests The Amazing.

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From "Mike & Molly", actress Melissa McCarthy; from "The Walking Dead", actor David Morrissey; musical guests David Byrne & St. Vincent.

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From "Bullet to the Head", actor Sylvester Stallone; former U.S. Vice President Al Gore.

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From "Identity Thief", actor Jason Bateman; from "Community", actress Alison Brie; musical guests Shovels & Rope.

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Fom "Stand Up Guys", actor Al Pacino; musical guests Macklemore & Ryan Lewis.

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From "House of Cards", actor Kevin Spacey; comic Nick Griffin; musical guest Emeli Sandé.

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New Jersey Governor Chris Christie; Super Bowl MVP Joe Flacco; a performance by Elvis tribute artist Cody Ray Slaughter.

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From "Modern Family", actor Eric Stonestreet; Trick: Norman will ride a scooter; from Sirius XM Radio, Chris "Mad Dog" Russo; a performance by Elvis tribute artist Brandon Bennett.

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From "Community", actor and TV host Joel McHale; actress and comedienne Amy Sedaris; a performance by Elvis tribute artist Justin Shandor.

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Actress Sally Field; Baltimore Ravens' John Harbaugh; a performance by Elvis tribute artist Shawn Klush.

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From "NCIS", actress Pauley Perrette; comedian Jake Johannsen; a performance by Elvis tribute artist Ben Portsmouth.

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Talk show host Bill O'Reilly; a Top Ten List presented by ten 2013 Sports Illustrated Swimsuit models and the 2013 S.I. Swimsuit cover model reveal; musical guests The Avett Brothers.

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From "A Good Day to Die Hard", actor Bruce Willis; 2013 Sports Illustrated Swimsuit cover model Kate Upton; musical guests Little Big Town.

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