S20E01 - Whitney Cummings, Nicole

S20E02 - Tracy Morgan, Rick & Corey Harrison, Shaggy

S20E03 - Michelle Williams, Josh Lucas, Chris Cornell

S20E04 - Glenn Close, Trevor Noah, Van Hunt

S20E05 - Janet Jackson, Larry the Cable Guy, Eli Young Band

S20E06 - Queen Latifah, Paul

S20E07 - Liam Neeson, Jack's Mannequin

S20E08 - Gerard Butler, Betty White

S20E09 - Tilda Swinton, Jennifer Hudson, Graffiti6

S20E10 - Sam Worthington, Sherri Shepherd, Adam Lambert

S20E11 - Jennifer Garner, Ross Matthews, Parachute

S20E12 - Wanda Sykes

S20E13 - Steven Tyler, Ryan Seacrest, Randy Jackson, Sarah Colonna

S20E14 - Madonna, Chris Colfer, Joe Perry

S20E15 - Michelle Obama, Mark Harmon, Imelda May

S20E16 - Daniel Radcliffe, Vanessa Hudgens, Evanescence

S20E17 - Drew Barrymore, Blake Shelton

S20E18 - Debra Messing, Jean Dujardin, Bush

S20E19 - Dwayne Johnson, Miranda Cosgrove, Cirque du Soleil

S20E20 - Chelsea Handler, Jon Huntsman, 2Cellos

S20E21 - Chris Pine, Lisa Lampanelli, Anthony Hamilton

S20E22 - Denzel Washington, Octavia Spencer, Estelle

S20E23 - Rachel McAdams, Cee-Lo Green

S20E24 - Jennifer Lopez, the Civil Wars

S20E25 - Tyler Perry, Alexandra Wentworth, the Cranberries

S20E26 - Bill Maher, Punch Brothers

S20E27 - Amanda Seyfried, Billy Gardell, Monica, Brandy

S20E28 - Christina Aguilera, Dave Salmoni, The Fray

S20E29 - Taylor Swift, Michael Clarke Duncan, Robert Randolph, Los Lobos, Chris Layton

S20E30 - Bill O'Reilly, Rob Riggle, Rumer

S20E31 - Tim Allen, Rocket City Rednecks

S20E32 - Meredith Vieira, Jackson Murphy

S20E33 - Jennifer Aniston, Adam Levine

S20E34 - Megan Fox, Michel Hazanavicius, Mariachi El Bronx

S20E35 - Rob Schneider, Khloe Kardashian Odom, Mona

S20E36 - Sen. John McCain, Elizabeth Olsen, Romeo Santos

S20E37 - Julianne Moore, Dr. Brady Barr, Chickenfoot

S20E38 - Emily Blunt, Geoff Stults, Scars on 45

S20E39 - Jessica Simpson, Adam Carolla, Soja

S20E40 - Jonah Hill, Bethenny Frankel, Shooter Jennings

S20E41 - Channing Tatum, Drew Brees, Meat Loaf

S20E42 - Kiefer Sutherland, Kathryn Hahn, Andy Grammer

S20E43 - Jimmy Fallon, 8-year-old presidential whiz kid H.L. McCullough, Toby Keith

S20E44 - Jamie Lee Curtis, Armie Hammer

S20E45 - Rep. Ron Paul, Frank Caliendo, the Wanted

S20E46 - Kim Kardashian

S20E47 - Arsenio Hall, Lily Collins

S20E48 - Christina Aguilera, Melanie Fiona featuring J. Cole

S20E49 - Elizabeth Banks, Carson Daly

S20E50 - The Pierces

S20E51 - Rainn Wilson, Debbie Gibson, Gavin DeGraw

S20E52 - Piers Morgan, Liam Hemsworth, Mat Kearney

S20E53 - Nicole Richie, Alan Jackson

S20E54 - Betty White, D.J. Pauly D

S20E55 - Maya Rudolph, Jason Biggs, Gym Class Heroes

S20E56 - David Gregory, Cee-Lo Green, Seal

S20E57 - Zac Efron, Jennie Garth, Grace Potter and the Nocturnals

S20E58 - Kristin Chenoweth, Julie Scardina, Rodrigo y Gabriela

S20E59 - Jane Lynch, Kevin Hart, Esperanza Spalding

S20E60 - Josh Hutcherson, Rachel Maddow, Eric Turner featuring Lupe Fiasco and Tinie Tempah

S20E61 - Albert Brooks, Austin

S20E62 - Blake Shelton, Chris Diamantopoulos, Feist

S20E63 - Jason Segel, Anna Faris, Far East Movement

S20E64 - Jesse Tyler Ferguson, Aubrey O'Day, Train

S20E65 - Jack Black, Daniel Holzman & Michael Chernow, Beirut

S20E66 - Adam Levine, Ziggy Marley

S20E67 - Diane Keaton, Natalie Coughlin, Moby

S20E68 - Mel Gibson, the Wanted

S20E69 - Steve Martin, Rashida Jones, Steve Martin & the Steep Canyon Rangers

S20E70 - Cameron Diaz, William Shatner, Lee Brice

S20E71 - Scarlett Johansson, Blake Shelton, K'Naan featuring Nelly Furtado

S20E72 - Robert Downey Jr., Katharine McPhee, Toast To Freedom

S20E73 - Kristen Stewart, James Morrison

S20E74 - Michelle Pfeiffer, Bear Grylls, Snow Patrol

S20E75 - Rick Santorum, Taylor Kitsch, B.o.B., O.A.R.

S20E76 - Garry Shandling, Alison Brie, the winner of 'The Voice'

S20E77 - Howie Mandel, Vinny Guadagnino, Sara Watkins

S20E78 - Jenna Fischer, Jay Mohr

S20E79 - Kourtney, Kim & Khloe Kardashian, Donny Deutsch, Karmin

S20E80 - Wanda Sykes, David Hasselhoff, Santana

S20E81 - Joel McHale, Jarod Miller, Bobby Brown

S20E82 - Hugh Laurie, Robert Griffin III

S20E83 - Sherri Shepherd, Julianne Hough, Tenacious D

S20E84 - Kevin Costner, Bailee Madison, Lisa Marie Presley

S20E85 - Josh Brolin, Ali Wentworth, Glenn Frey

S20E86 - Charlize Theron, Jeffrey Dean Morgan, Juanes

S20E87 - Glenn Close, the winner of American Idol, Nelly Furtado

S20E88 - Gen. Colin Powell, Greg Gadson, All American Rejects

S20E89 - Martin Short, Aubrey Plaza, Def Leppard

S20E90 - Emma Stone, Chris Hemsworth, Chris Robinson Brotherhood

S20E91 - Julia Louis-Dreyfus, the Beach Boys

S20E92 - Catherine Zeta-Jones, Louis Zamperini, Bret Michaels

S20E93 - Tom Cruise, skydivers Felix Baumgartner & Joe Kittinger, Kool & the Gang

S20E94 - Elizabeth Banks, Dan Patrick, Brandi Carlisle

S20E95 - Patrick Duffy, Linda Grey, Larry Hagman, Meghan McCain, Meiko

S20E96 - Terry Bradshaw, Ernie Brown Jr., Neal James, Rachel Bradshaw

S20E97 - Penelope Cruz, Rick Harrison, We Are Augustines

S20E98 - Salma Hayek, Adam Brody, Olly Murs

S20E99 - Steve Carell, Cory Booker, Glen Hansard

S20E100 - Matthew McConaughey, Natasha Leggero, Grouplove

S20E101 - Andy Samberg, Seth MacFarlane, Joe Henry featuring Lisa Hannigan

S20E102 - Katy Perry, Needtobreathe

S20E103 - Chris Pine, Rachael Ray, Everclear

S20E104 - Louis C.K., Lolo Jones, Delta Rae

S20E105 - Matt LeBlanc, Sig Hansen & Keith Colburn, Robin Thicke

S20E106 - Mila Kunis, Jim Norton, Justin Bieber

S20E107 - Tyler Perry, Rhys Ifans, Keane

S20E108 - Andrew Garfield, Of Monsters And Men

S20E109 - Wanda Sykes, Rob Riggle, Kimbra

S20E110 - Zachary Levi, B.o.B.

S20E111 - Morgan Freeman,

S20E112 - Denis Leary, Olivia Munn, Kenny Chesney

S20E113 - Dana Carvey, Nicki Minaj

S20E114 - Charlie Sheen

S20E115 - Kate Beckinsale, Adam Carolla

S20E116 - Newt Gingrich, Nicole

S20E117 - Rachel Weisz, Aaron Paul

S20E118 - Ben Stiller, Rose Byrne, Missy Higgins

S20E119 - Vince Vaughn, Travis Pastrana, Aretha Franklin

S20E120 - Colin Farrell, Jenni

S20E121 - Jessica Biel, Kevin Smith, the Lumineers

S20E122 - Julie Scardina, Dwyane Wade, MoZella

S20E123 - Jeremy Renner, Betty White, Joss Stone

S20E124 - Michelle Obama, Norah Jones

S20E125 - Kelsey Grammer, Jordan Burroughs, Ryan Star

S20E126 - Sylvester Stallone, Missy Franklin, Dwight Yoakam

S20E127 - Kristen Bell, Ryan Lochte, Regina Spektor

S20E128 - Jason Statham, Allyson Felix, the Offspring

S20E129 - Maya Rudolph, Jeff Foxworthy, Morning Parade

S20E130 - Shia LaBeouf, Jean-Claude Van Damme, fun.

S20E131 - Katie Couric, Dax Shepard, Emeli Sande

S20E132 - Kirsten Dunst, Chris Matthews, Smashing Pumpkins

S20E133 - Howie Mandel, Alejandro Escovedo

S20E134 - Dennis Miller, Joshua Radin

S20E135 - Owl City with Carly Rae Jepsen

S20E136 - Bill Maher, Tristan Prettyman

S20E137 - Savannah Guthrie, Dolph Lundgren

S20E138 - Lauren Graham, Dan Patrick

S20E139 - Kevin Hart, Rep. Ron Paul, Robert Cray

S20E140 - Adam Levine, Magic Johnson, Grace Potter

S20E141 - Ellen DeGeneres, Josh Lucas, Billy Ray Cyrus

S20E142 - Matthew Perry, Meghan McCain, OneRepublic

S20E143 - Richard Gere, Anthony Robles, Rascal Flatts

S20E144 - Justin Timberlake, Steve Nash, Ryan Bingham

S20E145 - Amy Poehler, Joe Scarborough, Big & Rich

S20E146 - Viola Davis, Paul Wesley, Bonnie Raitt

S20E147 - Zooey Deschanel, Anthony Anderson, ZZ Top

S20E148 - David Spade, Giancarlo Esposito, Rebecca Ferguson

S20E149 - Ann Romney, Seth MacFarlane, Bettye LaVette

S20E150 - Kirstie Alley, Mike

S20E151 - Liam Neeson, Lisa Lampanelli, the Gaslight Anthem

S20E152 - Christina Aguilera, Sherri Shepherd, the Piano Guys

S20E153 - Bryan Cranston, Rebel Wilson, Cher Lloyd

S20E154 - Carol Burnett, Armie Hammer, Lang Lang

S20E155 - Christina Applegate, Apolo Anton Ohno

S20E156 - Ben Affleck, Octavia Spencer, Neon Trees

S20E157 - Colin Farrell, Medal of Honor recipient Dakota Meyer, the Hives

S20E158 - Arnold Schwarzenegger, Bubba Watson, the Wallflowers

S20E159 - Tyler Perry, Oscar Pistorius, Plain White T's

S20E160 - Chelsea Handler, Placido Domingo

S20E161 - Terry Bradshaw, Mark Kelly, Grizzly Bear

S20E162 - Whitney Cummings, Rove McManus, the Script

S20E163 - Halle Berry, Ali Wentworth, Gary Clark Jr.

S20E164 - Denzel Washington, Richard Engel, M. Ward

S20E165 - President Barack Obama, No Doubt

S20E166 - Russell Brand, Jane Lynch

S20E167 - Sarah Silverman, Paula Deen

S20E168 - Simon Cowell, Britney Spears, Billy Gardell, Two Door Cinema Club

S20E169 - John C. Reilly, Jenni

S20E170 - Taylor Lautner, Lior Suchard, Macy Gray

S20E171 - Jamie Lee Curtis, Maggie Elizabeth Jones, ZZ Ward

S20E172 - Marion Cotillard, Olate Dogs

S20E173 - Kristen Stewart, Dax Shepard, Kip Moore

S20E174 - Daniel Craig, Dave Salmoni, Diamond Rings

S20E175 - Sally Field, Chris Matthews, Lord Huron

S20E176 - Meredith Vieira & Richard Cohen, Christina Perri

S20E177 - Lea Michele, Nev Schulman, Toby Keith

S20E178 - Keira Knightley, Whitney Cummings, Gin Wigmore

S20E179 - Helen Hunt, Paul

S20E180 - Tim Allen, Nolan Gould, Switchfoot

S20E181 - Chris Matthews, the Mowgli's

S20E182 - Jennifer Lawrence, Phil & Willie Robertson, Andy Grammer

S20E183 - Lindsay Lohan, David Gregory, Wanda Jackson

S20E184 - Joseph Gordon-Levitt, Kris Jenner, Dan Cummings

S20E185 - Bradley Cooper, Natasha Leggero, PSY

S20E186 - Jim Parsons, Maggie Elizabeth Jones, Delta Rae

S20E187 - Julie Bowen,

S20E188 - Wanda Sykes, Blake Shelton

S20E189 - Newt Gingrich, Ron Shirley, Grouplove

S20E190 - Marisa Tomei, Carson Daly, Il Volo

S20E191 - Gerard Butler, Olivia Munn, the Polyphonic Spree

S20E192 - Khloe Kardashian Odom, Adam Carolla, Matisyahu

S20E193 - Don Johnson, Julie Scardina, Darius Rucker

S20E194 - Bill O'Reilly, Krysten Ritter, Paloma Faith

S20E195 - Leslie Mann, Jim Rome, Garbage

S20E196 - Matt Damon, Chris Pratt, Of Monsters And Men

S20E197 - Ewan McGregor, Bailee Madison, Allen Stone

S20E198 - Albert Brooks, Kerry Washington, Willy Moon

S20E199 - Hugh Jackman, Maria Sharapova, J.D. McPherson

S20E200 - Bette Midler, Judd Apatow, Pentatonix

S20E201 - Megan Fox, Johnny Manziel, Colbie Caillat

S20E202 - Quentin Tarantino, LeAnn Rimes

S20E203 - Jamie Foxx, Carl Reiner, the winner of

S20E204 - Katherine Heigl, Marjorie Johnson, Johnny Mathis

S20E205 - Terry Bradshaw, Elle Fanning, Chris Mann