S21 E1: Kevin Hart, Betty White, Dwight Yoakam

S21 E2: Arnold Schwarzenegger, Chumlee & Rick Harrison, Ziggy Marley

S21 E3: Courteney Cox, Joy Behar, Youngblood Hawke

S21 E4: Bill Maher, Nicole

S21 E5: Emma Stone, Josh Gad, the Whigs

S21 E6: Big Bad Voodoo Daddy

S21 E7: Ryan Seacrest, Keith Urban, Randy Jackson, Anthony Jeselnik, For King and Country

S21 E8: Ben Affleck, Kristen Bell, Rodriguez

S21 E9: Nicki Minaj, Billy Connolly, The Saturdays

S21 E10: Jessica Simpson, D.L. Hughley, Vintage Trouble

S21 E11: Mark Wahlberg, Ali Wentworth, JJamz

S21 E12: Naomi Watts, Richard Engel, Train

S21 E13: Chris Tucker, Bob Costas, Big Boi

S21 E14: Sally Field, Michael Kosta, Lord Huron

S21 E15: Dana Carvey, Emmy Rossum, Ben Harper with Charlie Musselwhite

S21 E16: Heidi Klum, Seann Willam Scott, Gary Allan

S21 E17: Dustin Hoffman, Kenny Loggins and Blue Sky Riders

S21 E18: Robert DeNiro

S21 E19: Catherine Zeta-Jones, Donny Deutsch, Lady Antebellum

S21 E20: Whitney Cummings, Jackie Weaver, Aaron Neville

S21 E21: Charlie Sheen, Holly Williams

S21 E22: Piers Morgan, Quvenzhane Wallis, Benh Zeitlin, Lisa Loeb

S21 E23: Wanda Sykes, Branford Marsalis

S21 E24: Hugh Jackman, Jessica Chastain, Michael Bolton

S21 E25: Josh Duhamel, Kathryn Bigelow, Lianne La Havas

S21 E26: Tim McGraw, Bar Refaeli

S21 E27: Amy Adams, Adam Carolla, Hunter Hayes

S21 E28: Seth MacFarlane, Jenna Elfman, Norah Jones

S21 E29: James Spader, Lior Suchard, Far East Movement

S21 E30: Charles Barkley, Bob Fisher, Jewel

S21 E31: Anne Hathaway, Lester Holt, Eli Young Band

S21 E32: Jarod Miller, Timothy Olyphant, Colbie Caillat & Gavin DeGraw

S21 E33: Kathy Griffin, David Feherty, FM Radio

S21 E34: Kevin Bacon, Dennis Rodman, Kevin Eubanks

S21 E35: Robin Wright, Josh Gad, Bonnie Raitt

S21 E36: Chelsea Handler, Edythe Kirchmaier, Sky Blu

S21 E37: Arsenio Hall, Tristan Prettyman

S21 E38: Meredith Vieira, Richard Roeper, thenewno2

S21 E39: Russell Crowe, Eli Roth, Robert Randolph with the Slide Brothers

S21 E40: Colin Farrell, Joey King, Boz Scaggs

S21 E41: David Duchovny, J.B. Smoove, Father John Misty

S21 E42: Steve Carell, Joey King, Shooter Jennings

S21 E43: Bill O'Reilly, Abigail Breslin, the Mavericks

S21 E44: Halle Berry, Rachel Maddow, Ashley Monroe

S21 E45: Olivia Wilde, Nick Offerman, Buddy Guy and The Experience Hendrix All-Star Band

S21 E46: Jerry Seinfeld, Mark Cuban, Jose James

S21 E47: James Franco, Jay Mohr, Owl City with Yuna

S21 E48: Craig Ferguson, Vera Farmiga, Harper Simon

S21 E49: Morgan Freeman, Olympic wrestlers Rulon Gardner & Henry Cejuda, The James Hunter Six

S21 E50: Jenna Fischer, Dennis Rodman, Black Prairie

S21 E51: Vanessa Hudgens, Chris O'Dowd, Gary Clark Jr.

S21 E52: Dwayne Johnson, Chris Paul, Atlas Genius

S21 E53: Don Cheadle, Louie Anderson, Wiz Khalifa feat. Akon

S21 E54: Gerard Butler, Keegan-Michael Key & Jordan Peele, Crystal Bowersox

S21 E55: Keith Urban, Paula Deen, Django Django

S21 E56: Kristin Chenoweth, magician Justin Willman, Josh Groban

S21 E57: Kim Kardashian, Willie Geist, Imagine Dragons

S21 E58: Matthew Perry, Kristen Schaal, The Goo Goo Dolls

S21 E59: Blake Shelton, Jim Rome

S21 E60: Rosario Dawson, Max Greenfield, Gloriana

S21 E61: Eva Longoria, Terry Crews, Cavalia's Odysseo

S21 E62: Demetri Martin, animal trainer Julie Scardina, Gin Wigmore

S21 E63: Julia Louis-Dreyfus, Anthony Jeselnik, Vintage Trouble

S21 E64: Rebel Wilson, Jackson Galaxy, Hanson

S21 E65: Charlie Sheen, coach Andy Enfield, Brad Paisley

S21 E66: LL Cool J, Andy Cohen, Tegan and Sara

S21 E67: Adam Levine, Cyndi Lauper, The Airborne Toxic Event

S21 E68: Diane Keaton, Trevor Moore, Jake Bugg

S21 E69: Carol Burnett, Stephen Amell, Plain White T's

S21 E70: Emily Blunt, Tom Cruise, Black Rebel Motorcycle Club

S21 E71: Gwyneth Paltrow, JB Smoove, Billy Ray Cyrus

S21 E72: Robert Downey Jr., Avril Lavigne

S21 E73: Ben Kingsley, Larry the Cable Guy, The Band Perry

S21 E74: Cher & Georgia Holt, Dov Davidoff, Florida Georgia Line

S21 E75: Kathy Griffin, Eli Roth, Cheap Trick

S21 E76: Matt Lauer, Awolnation

S21 E77: Chris Evans, Kevin Smith

S21 E78: Magic Johnson, Savannah Guthrie, Fall Out Boy

S21 E79: Connie Sawyer, Patty Griffin

S21 E80: Ken Jeong, Emeli Sandé

S21 E81: Shakira, Marc Maron, Tom Jones

S21 E82: Aaron Eckhart, Sherri Shepherd, 98 Degrees

S21 E83: Miranda Lambert, Ross Mathews, Pistol Annies

S21 E84: Wanda Sykes, Martha Stewart, Drop City Yacht Club

S21 E85: Usher, Nick Offerman, Pyyramids

S21 E86: Adam Sandler, Phil Jackson, Family of the Year

S21 E87: Mitt Romney, “American Idol” winner Candice Glover

S21 E88: Bradley Cooper, Heidi Klum, The-Dream with Kelly Rowland

S21 E89: Eric Stonestreet, Jeremy Wade, Thompson Square

S21 E90: Vin Diesel, Jeff Foxworthy, The Lone Bellow

S21 E91: Tyler Perry, Isla Fisher, Shout Out Louds

S21 E92: Howie Mandel, Sal Basille & Francis Garcia, Sigur Rós

S21 E93: Vince Vaughn, Kenny Smith, Scotty McCreery

S21 E94: Owen Wilson, Wayde King & Brett Raymer, LeAnn Rimes

S21 E95: Danny McBride, Khloe Kardashian Odom, The Wanted

S21 E96: Henry Cavill, Jessica Buchanan & Erik Landemalm, She & Him

S21 E97: Russell Crowe, Andrea Bocelli

S21 E98: Kevin Bacon, Mel B, Bad Company

S21 E99: Jamie Foxx, Jimmy Connors, Matthew Morrison

S21 E100: Kevin Hart, Jeremy Scahill, Trace Adkins & Colbie Caillat

S21 E101: Carson Daly, Betty White, Timeflies

S21 E102: Armie Hammer, Dave Salmoni, The Boxer Rebellion

S21 E103: Billy Crystal, Pitbull feat. Danny Mercer

S21 E104: Kathy Griffin, Billy Gardell, Grouplove

S21 E105: David Gregory, J Chris Newberg, “The Voice” winner Danielle Bradbery

S21 E106: Kristin Davis, Harvey Fierstein, The Mowgli's

S21 E107: Terry Bradshaw, Steve Byrne, Joseph Arthur

S21 E108: Steve Carell, Ken Ilgunas, Barenaked Ladies

S21 E109: Sandra Bullock, Bob Saget, Il Volo

S21 E110: Whitney Cummings, Alex Minsky, John Fogerty

S21 E111: David Spade, Joey King, Grace Potter & The Nocturnals

S21 E112: Wanda Sykes, India.Arie

S21 E113: Charlie Day, Jeffrey Dean Morgan, Lionel Richie

S21 E114: Dane Cook, Nev Schulman, Matt Nathanson

S21 E115: John Malkovich, Olivia Munn, Blackberry Smoke

S21 E116: Helen Mirren, Ben Schwartz, The Olms

S21 E117: Bill Hader, Passenger

S21 E118: Savannah Guthrie, Anthony Jeselnik, Johnnyswim

S21 E119: Zachary Levi, Danica Patrick, Talib Kweli feat. Nelly & Abby Dobso

S21 E120: Jane Lynch, Serena Ryder

S21 E121: Anthony Hopkins, Amy Schumer, Robert Randolph & The Family Band

S21 E122: Howie Mandel, Marisa Miller, Sara Bareilles

S21 E123: Gillian Anderson, Jim Rash & Nat Faxon, Kenny Chesney

S21 E124: Aaron Paul, Selena Gomez

S21 E125: Ashton Kutcher, Jayma Mays, Hiatus Kaiyote

S21 E126: Cate Blanchett, Michael B. Jordan, Court Yard Hounds

S21 E127: Katy Perry, Cris Collinsworth, Kacey Musgraves

S21 E128: Kristen Bell, Phillip Phillips

S21 E129: Kristin Chenoweth, Josh Gad

S21 E130: Kate Hudson, Bob Costas, Kopecky Family Band

S21 E131: Casey Affleck, Allison Janney

S21 E132: Meredith Vieira, Jim Norton, Charlie Worsham

S21 E133: Bryan Cranston, Amos Lee

S21 E134: Matt LeBlanc, Mark Cuban, KT Tunstall

S21 E135: Matt Damon, Anna Faris, Parachute

S21 E136: Robin Williams, Gavin DeGraw

S21 E137: Jason Sudeikis, “Fry It & Try It” with Jim Stacy, White Lies

S21 E138: Jeff Daniels, Sherri Shepherd, Quinn Sullivan

S21 E139: Josh Duhamel, Macklemore & Ryan Lewis

S21 E140: Matt LeBlanc, Kathryn Hahn, Sky Blu

S21 E141: Julie Scardina, Rod Stewart

S21 E142: Senator John McCain

S21 E143: Bill Maher, Shaun White, Bad Things

S21 E144: Christina Applegate, Rob Corddry, White Lies

S21 E145: Vince Vaughn, Vintage Trouble

S21 E146: Simon Cowell

S21 E147: Martin Short, Meghan McCain, Backstreet Boys

S21 E148: Rose Byrne, Jennifer Nettles

S21 E149: Charlie Sheen, Jim Rome, Trombone Shorty

S21 E150: Hugh Jackman, OneRepublic

S21 E151: Zooey Deschanel, Terry Crews, Buena Vista Social Club

S21 E152: Chris Hemsworth, Kristen Schaal, Sheryl Crow

S21 E153: Neil Patrick Harris, Five for Fighting

S21 E154: Christina Aguilera, Joy Behar, Valerie June

S21 E155: Tim Allen, Dwayne Wade, Fitz and The Tantrums

S21 E156: Jimmy Fallon

S21 E157: Justin Timberlake, Paula Patton

S21 E158: Olivia Wilde, Adam Scott, Cher Lloyd

S21 E159: Dana Carvey, Cee-Lo Green, Goodie Mob

S21 E160: Julia Louis-Dreyfus, Ron Paul, Little Big Town

S21 E161: Sandra Bullock, 13 year-old chef Jack Witherspoon

S21 E162: Magic Johnson, Marjorie Johnson, Gary Clark Jr.

S21 E163: Joseph Gordon-Levitt, Jay Mohr, Ariana Grande & Mika

S21 E164: Kathy Griffin, Newt Gingrich, Demi Lovato

S21 E165: Julianne Moore, Billy Gardell

S21 E166: Terry Bradshaw, “Fantasy Football Tattoo League”

S21 E193: President George W. Bush & Laura Bush, Ben Harper with Charlie Musselwhite