21x33 - Stupid Human Tricks, Simon Helberg, Young the Giant

February 27, 2014

21x34 - Jack (Jungle) Hanna, Jake Johannsen

February 28, 2014

21x35 - Zach Braff, Sgt. Brendan Marrocco & Dr. Andrew Lee, Future Islands

March 3, 2014

21x36 - Michael Keaton, Phantogram

March 4, 2014

21x37 - Tom Selleck, Carrie Brownstein, David Nail

March 5, 2014

21x38 - Tom Brokaw, Andrew Hadlock, Bob Mould

March 6, 2014

21x39 - Mary-Louise Parker, Lenny Marcus, Joan Jett & the Blackhearts

March 7, 2014

21x40 - Sen. John McCain, Little Mix

March 10, 2014

21x41 - Jason Bateman, Miles Teller, Gary Allan

March 11, 2014

21x42 - Sylvester Stallone, Theo James, Ledisi

March 12, 2014

21x43 - Bryan Cranston, Melissa Rauch, Le1f

March 13, 2014

21x44 - Bill O'Reilly, Nick Griffin, the Dough Rollers

March 14, 2014

21x45 - Jimmy Carter

March 24, 2014

21x46 - Emma Watson, Nick Offerman, a musical tribute to Johnny Cash

March 25, 2014

21x47 - Peter Dinklage, Hari Kondabolu, Sage the Gemini

March 26, 2014

21x48 - Cobie Smulders, Nick Cannon, Manchester Orchestra

March 31, 2014

21x49 - Kristin Chenoweth, Amy Schumer, Johnnyswim

April 1, 2014

21x50 - Bill Murray, Martha Stewart, Lady Gaga

April 2, 2014

21x51 - Johnny Depp, Kevin Drew

April 3, 2014

21x52 - Billy Crystal, Tony Hale, Liv Warfield

April 4, 2014

21x53 - Rob Lowe, Brooklyn Decker, London Grammar

April 8, 2014

21x54 - Lindsay Lohan, Jamie Edwards, Real Estate

April 9, 2014

21x55 - Courteney Cox, Jimmie 'J.J.' Walker, Christina Perri

April 21, 2014

21x56 - Stephen Colbert, Robin Roberts, Kelis

April 22, 2014

21x57 - Sally Field, Timothy Simons, Needtobreathe

April 23, 2014

21x58 - Neil Patrick Harris, Sarah Hyland, Ray LaMontagne

April 24, 2014

21x59 - Piedmont Bird Callers, Michael J. Fox, Naughty Boy

April 25, 2014

21x60 - Joel McHale, Vera Farmiga, Aloe Blacc

April 28, 2014

21x61 - Lucy Liu, Ziggy Marley

April 29, 2014

21x62 - Kiefer Sutherland, Adam Resnick, Benjamin Booker

April 30, 2014

21x63 - Louis C.K., a performance from the Broadway cast of Rocky

May 1, 2014

21x64 - Don Rickles, Carmen Lynch, the Ghost of a Saber Tooth Tiger

May 2, 2014

21x65 - Shailene Woodley, Peyton Manning

May 5, 2014

21x66 - Jon Cryer, Elizabeth Olsen, Foster the People

May 6, 2014

21x67 - Mariah Carey, Rick Harrison

May 7, 2014

21x68 - James Franco, Idina Menzel, a performance by the Broadway cast of 'If/Then'

May 8, 2014

21x69 - Nathan Fillion, Tom Dreesen, Hunter Hayes

May 9, 2014

21x70 - Harry Connick Jr., Jesse Eisenberg, the Black Keys

May 12, 2014

21x71 - Jim Parsons, Julie Chen, Hozier

May 13, 2014

21x72 - Barbara Walters, Elle Fanning, Randy Houser

May 14, 2014

21x73 - Adam Sandler, Thomas Haden Church

May 15, 2014

21x74 - Lea Michele, Andy Kindler, Chromeo

May 16, 2014

21x75 - Jack Hanna, Stephen Malkmus & the Jicks

May 19, 2014

21x76 - Kid scientists, Sarah Silverman, We Are Scientists

May 20, 2014

21x77 - Sgt. Kyle J. White, Judy Greer, Dierks Bentley

May 21, 2014

21x78 - Donald Trump, Indianapolis 500 winner Ryan Hunter-Reay, Elizabeth Cook

June 2, 2014

21x79 - Martin Short, John Oliver, Spanish Gold

June 3, 2014

21x80 - Anderson Cooper, Victor Espinoza, the Afghan Whigs

June 4, 2014

21x81 - Hugh Jackman, Joe List, Elvis Costello

June 5, 2014

21x82 - Kelsey Grammer, Willie Nelson

June 9, 2014

21x84 - Christopher Walken, Janelle Monae, Tatiana Maslany, Miss USA 2014

June 11, 2014

21x85 - Regis Philbin, Paul Morrissey, First Aid Kit

June 12, 2014

21x86 - Susan Sarandon, Whitney Cummings, Angel Olsen, David Sanborn

June 16, 2014

21x87 - Olivia Wilde, Shep Gordon, Empires

June 17, 2014

21x88 - Dana Carvey, Ellie Kemper, Sam Smith

June 18, 2014

21x89 - Paul Rudd, Jeff Altman, John Doe

June 19, 2014

21x90 - Adam Levine, Gen. Frank J. Grass, Broken Bells

June 23, 2014

21x91 - Melissa McCarthy, Rachelle Lefevre, Phish

June 24, 2014

21x92 - Mark Wahlberg, Ben Falcone, Hurray for the Riff Raff

June 25, 2014

21x93 - Mark Ruffalo, Former Marine Lance Cpl. William 'Kyle' Carpenter

June 26, 2014

21x94 - Halle Berry, Steve Young, War on Drugs

July 7, 2014

21x95 - Joan Rivers, Capital Cities

July 8, 2014

21x96 - Lizzy Caplan, Sleeper Agent

July 9, 2014

21x97 - Michael Douglas, Paul Morrissey, Kiesza

July 10, 2014

21x98 - Kurt Russell, Hannibal Buress, Sturgill Simpson

July 14, 2014

21x99 - Jason Segel, Liv Tyler, Trampled By Turtles

July 15, 2014

21x100 - Emma Stone, Nathan Fielder, American Authors

July 16, 2014

21x101 - Colin Firth, Tommy Johnagin, EMA

July 17, 2014

21x102 - Jeff Daniels, Norah O'Donnell, A Special Performance of 'MacArthur Park'

July 21, 2014

Dave welcomes actor Jeff Daniels, "CBS This Morning" co-anchor Norah O'Donnell, and a performance of the song "MacArthur Park" by an all-star ensemble.

21x103 - Ricky Gervais, Taylor Schilling, Eli Young Band

July 22, 2014

21x104 - Eric Stonestreet, Brody Dalle

July 23, 2014

21x105 - Staff Sgt. Ryan Pitts, Sharon Van Etten

July 24, 2014

21x106 - John C. Reilly, Rachelle Lefevre, Conor Oberst

July 28, 2014

21x107 - Chris Pratt, Rodrigo y Gabriela

July 29, 2014

21x108 - Zoe Saldana, Crash

July 30, 2014

21x109 - Julia Louis-Dreyfus, Simon Amstell, David Gray

July 31, 2014

21x110 - Bruce Willis, the Gaslight Anthem

August 18, 2014

21x111 - Joseph Gordon-Levitt, Novak Djokovic, Robby Johnson

August 19, 2014

21x112 - Kathy Griffin, Ken Burns, Jeremy Messersmith

August 20, 2014

21x113 - Serena Williams, Chadwick Boseman, Echo & the Bunnymen

August 21, 2014

21x114 - Michael Cera, dock diving dogs, Lyle Lovett

August 25, 2014

21x115 - Howie Mandel, EMA

August 26, 2014

21x116 - James McAvoy, Chris Russo, The Last Internationale

August 27, 2014

21x117 - Mike Myers, Bonnie McFarlane, John Fullbright

August 28, 2014

21x118 - Luke Wilson, Julie Chen, Lee Brice

September 2, 2014