21x108 - Steve Carell, Ken Ilgunas, Barenaked Ladies

June 24, 2013

21x109 - Sandra Bullock, Bob Saget, Il Volo

June 25, 2013

21x110 - Whitney Cummings, Alex Minsky, John Fogerty

June 26, 2013

21x111 - David Spade, Joey King, Grace Potter & The Nocturnals

June 27, 2013

21x112 - Wanda Sykes, India.Arie

June 28, 2013

21x113 - Charlie Day, Jeffrey Dean Morgan, Lionel Richie

July 8, 2013

21x114 - Dane Cook, Nev Schulman, Matt Nathanson

July 9, 2013

21x115 - John Malkovich, Olivia Munn, Blackberry Smoke

July 10, 2013

21x116 - Helen Mirren, Ben Schwartz, The Olms

July 11, 2013

21x117 - Bill Hader, Passenger

July 12, 2013

21x118 - Savannah Guthrie, Anthony Jeselnik, Johnnyswim

July 15, 2013

21x119 - Zachary Levi, Danica Patrick, Talib Kweli feat. Nelly & Abby Dobso

July 16, 2013

21x120 - Jane Lynch, Serena Ryder

July 17, 2013

21x121 - Anthony Hopkins, Amy Schumer, Robert Randolph & The Family Band

July 18, 2013

21x122 - Howie Mandel, Marisa Miller, Sara Bareilles

July 19, 2013

21x123 - Gillian Anderson, Jim Rash & Nat Faxon, Kenny Chesney

July 22, 2013

21x124 - Aaron Paul, Selena Gomez

July 23, 2013

21x125 - Ashton Kutcher, Jayma Mays, Hiatus Kaiyote

July 24, 2013

21x126 - Cate Blanchett, Michael B. Jordan, Court Yard Hounds

July 25, 2013

21x127 - Katy Perry, Cris Collinsworth, Kacey Musgraves

July 26, 2013

21x128 - Kristen Bell, Phillip Phillips

July 29, 2013

21x129 - Kristin Chenoweth, Josh Gad

July 30, 2013

21x130 - Kate Hudson, Bob Costas, Kopecky Family Band

July 31, 2013

21x131 - Casey Affleck, Allison Janney

August 1, 2013

21x132 - Meredith Vieira, Jim Norton, Charlie Worsham

August 2, 2013

21x133 - Bryan Cranston, Amos Lee

August 5, 2013

21x134 - Matt LeBlanc, Mark Cuban, KT Tunstall

August 6, 2013

21x135 - Matt Damon, Anna Faris, Parachute

August 7, 2013

21x136 - Robin Williams, Gavin DeGraw

August 8, 2013

21x137 - Jason Sudeikis, “Fry It & Try It” with Jim Stacy, White Lies

August 9, 2013

21x138 - Jeff Daniels, Sherri Shepherd, Quinn Sullivan

August 26, 2013

21x139 - Josh Duhamel, Macklemore & Ryan Lewis

August 27, 2013

21x140 - Matt LeBlanc, Kathryn Hahn, Sky Blu

August 28, 2013

21x141 - Julie Scardina, Rod Stewart

August 29, 2013

21x142 - Senator John McCain

August 30, 2013

21x143 - Bill Maher, Shaun White, Bad Things

September 3, 2013

21x144 - Christina Applegate, Rob Corddry, White Lies

September 4, 2013

21x145 - Vince Vaughn, Vintage Trouble

September 5, 2013

21x146 - Simon Cowell

September 6, 2013

21x147 - Martin Short, Meghan McCain, Backstreet Boys

September 9, 2013

21x148 - Rose Byrne, Jennifer Nettles

September 10, 2013

21x149 - Charlie Sheen, Jim Rome, Trombone Shorty

September 11, 2013

21x150 - Hugh Jackman, OneRepublic

September 12, 2013

21x151 - Zooey Deschanel, Terry Crews, Buena Vista Social Club

September 13, 2013

21x152 - Chris Hemsworth, Kristen Schaal, Sheryl Crow

September 16, 2013

21x153 - Neil Patrick Harris, Five for Fighting

September 17, 2013

21x154 - Christina Aguilera, Joy Behar, Valerie June

September 18, 2013

21x155 - Tim Allen, Dwayne Wade, Fitz and The Tantrums

September 19, 2013

21x156 - Jimmy Fallon

September 20, 2013

21x157 - Justin Timberlake, Paula Patton

September 23, 2013

21x159 - Dana Carvey, Cee-Lo Green, Goodie Mob

September 25, 2013

21x160 - Julia Louis-Dreyfus, Ron Paul, Little Big Town

September 26, 2013

21x161 - Sandra Bullock, 13 year-old chef Jack Witherspoon

September 27, 2013

21x162 - Magic Johnson, Marjorie Johnson, Gary Clark Jr.

September 30, 2013

21x163 - Joseph Gordon-Levitt, Jay Mohr, Ariana Grande & Mika

October 1, 2013

21x164 - Kathy Griffin, Newt Gingrich, Demi Lovato

October 2, 2013

21x165 - Julianne Moore, Billy Gardell

October 3, 2013

21x166 - Terry Bradshaw, “Fantasy Football Tattoo League”

October 4, 2013

21x193 - President George W. Bush & Laura Bush, Ben Harper with Charlie Musselwhite

November 19, 2013

Bil Dwyer preempted.