S18 E1: Jamie Foxx, Lindsey Vonn, Brad Paisley

S18 E2: Sarah Palin, Shaun White, Adam Lambert

S18 E3: "Jaywalk All-Stars" with the cast of "Jersey Shore", Chelsea Handler, Apolo Anton Ohno, Avril Lavigne

S18 E4: Brett Favre, Matthew McConaughey, Jason Reitman

S18 E5: Morgan Freeman, Meredith Vieira

S18 E6: Simon Cowell, Richard Roeper, Ben Harper

S18 E7: Christoph Waltz, Dave Salmoni, Joan Jett & the Blackhearts

S18 E8: Kristen Stewart, Guy Fieri, Ryan Bingham

S18 E9: Dana Carvey, Kim Kardashian, Colbie Caillat

S18 E10: Dakota Fanning, Judd Apatow, Katharine McPhee

S18 E11: Terry Bradshaw, Kara DioGuardi, Ziggy Marley

S18 E12: Hugh Jackman, Betty White, Collective Soul

S18 E13: Dwayne Johnson, kid inventors, Switchfoot

S18 E14: Janet Jackson, Clark Duke, Orianthi

S18 E15: John Cusack, Heidi Montag, Barenaked Ladies

S18 E16: Charles Barkley, Kenny Smith, Ernie Johnson, k.d. lang

S18 E17: Gerard Butler, Sofia Vergara, Rodrigo y Gabriela

S18 E18: Ed Helms, Pamela Anderson, Snoop Dogg

S18 E19: Miley Cyrus, Tom Papa, Puddle of Mudd

S18 E20: Craig T. Nelson, Rumer Willis, Ludacris

S18 E21: Lauren Graham, Karl Rove, Joss Stone

S18 E22: Joy Behar, Thomas Haden Church, Shooter Jennings

S18 E23: Bill Maher, Wayne Vandenlangenberg, OneRepublic

S18 E24: Zachary Levi, Bear Grylls, Justin Bieber

S18 E25: Randy Jackson, Matthew & Amy Roloff, Monica

S18 E26: Kirstie Alley, David Boreanaz, Slash & Andrew Stockdale

S18 E27: David Duchovny, Kendra Wilkinson-Baskett, Corinne Bailey Rae

S18 E28: Demi Moore, Rep. Barney Frank, Train

S18 E29: Julie Scardina, Mary McCormack, Michael Kosta

S18 E30: Russell Crowe, Jenna Elfman, Sade

S18 E31: Nicolas Cage, Lisa Lampanelli, Lady Antebellum

S18 E32: Tracy Morgan, Chloe Moretz, Alan Jackson

S18 E33: Kate Gosselin, Kenny Chesney

S18 E34: Hugh Jackman, Betty White, Collective Soul

S18 E35: Brooke Shields, Phoenix

S18 E36: Heidi Klum, Ken Jeong, Smashing Pumpkins

S18 E37: Jennifer Lopez, Chace Crawford, Natalie Merchant

S18 E38: Jeff Corwin, Pierce Brosnan, Maxwell

S18 E39: Creed

S18 E40: Joel McHale, "Real Housewives of New Jersey" Caroline Manzo, Jacqueline Laurita & Teresa Giudice, Melissa Etheridge

S18 E41: Jessica Simpson, Jackie Earle Haley, Dierks Bentley

S18 E42: Chelsea Handler, Aqualung

S18 E43: Arnold Schwarzenegger, Sig Hansen, Laura Bell Bundy

S18 E44: Mickey Rourke, Ashley Graham

S18 E45: Julia Louis-Dreyfus, Jon Favreau, Godsmack

S18 E46: Scarlett Johansson, Frank Caliendo, Michael Bolton

S18 E47: Robert Downey Jr., Mindy Kaling

S18 E48: Samuel L. Jackson, Kara DioGuardi, Jason Derulo

S18 E49: Don Cheadle, Erin Andrews

S18 E50: Laura Bush, Donald Trump, Limp Bizkit

S18 E51: Amanda Seyfried, Guy Fieri, Luke Bryan

S18 E52: Betty White, Jarod Miller, Macy Gray

S18 E53: Garry Shandling, Ellie Kemper, Jakob Dylan

S18 E54: Donald Trump, the Jonas Brothers, Neon Trees

S18 E55: Bill Cosby, Ricky Gervais, Taio Cruz

S18 E56: Michael Douglas, Charles Barkley, Joe Nichols

S18 E57: Eddie Murphy, Carrie Ann Inaba, Bruno Tonioli, Damian Marley with Nas

S18 E58: Chelsea Handler, Chris Matthews, Sarah McLachlan

S18 E59: Kiefer Sutherland, Mary Lynn Rajskub, Adam Lambert

S18 E60: Russell Brand, David Gregory, Bettye Lavette

S18 E61: Bret Michaels, Jane Krakowski, John Butler Trio

S18 E62: Kathy Griffin, Paula Deen, Hanson

S18 E63: Katherine Heigl, Matthew Morrison, Allison Moorer

S18 E64: Colin Farrell, Elisabeth Moss, Kevin Eubanks

S18 E65: Mickey Rourke, Ashley Graham, Kevin Meaney

S18 E66: Jennifer Lopez, Donald Glover, Natalie Merchant

S18 E67: Jessica Simpson, Jackie Earle Haley, Dierks Bentley

S18 E68: Ed Helms, Pamela Anderson, Snoop Dog

S18 E69: Eddie Murphy, Mary Lynn Rajskub, Nas and Damian Marley

S18 E70: Howie Mandel, Jillian Michaels, Hole

S18 E71: Chris Rock, Nicole "Snooki" Polizzi, Sting

S18 E72: Adam Sandler, Rachel Maddow, OK Go

S18 E73: Denis Leary, Judd Apatow, Alanis Morissette

S18 E74: Tim Allen, Against Me!

S18 E75: Josh Brolin, Ashley Greene, Cee-Lo

S18 E76: Robert Pattinson, Emma Roberts, Travie McCoy

S18 E77: Lauren Graham, Rob Schneider, Matisyahu

S18 E78: Jonah Hill, Quinton "Rampage" Jackson, Punch Brothers

S18 E79: David Spade, Dan Riskin, Kelis

S18 E80: Dakota Fanning, Daniel Tosh, Crystal Bowersox

S18 E81: Queen Latifah, Mike "The Situation" Sorrentino, Robert Randolph

S18 E82: Jeremy Piven, Louis C.K., Drake

S18 E83: Tom Cruise, Bryce Dallas Howard, Sharon Jones & the Dap-Kings

S18 E84: Cameron Diaz, Dan Riskin, Lee DeWyze

S18 E85: Jason Segel, Jenni "JWoww" Farley, Enrique Iglesias

S18 E86: Dave Salmoni, John C. Reilly, Big Boi

S18 E87: Steve Carell, Jane Lynch, Michael Palascak

S18 E88: Adrien Brody, Chris Isaak

S18 E89: Seth Meyers, Jonathan Hillstrand & Josh Harris, Tracy Bonham

S18 E90: Jennifer Love Hewitt, Jay Baruchel, Nikki & Rich

S18 E91: Tracy Morgan, Drew Brees, Flo Rida

S18 E92: Ellen Page, Austin "Chumlee" Russell & Corey Harrison, Grace Potter & the Nocturnals

S18 E93: Craig Kilborn, Stephen Moyer, the Swell Season

S18 E94: Don Rickles, Dwyane Wade, KISS

S18 E95: Zac Efron, Lior Suchard, the Black Keys

S18 E96: Chelsea Handler, Matt Bomer, Metric

S18 E97: Jack Rebney & Ben Steinbauer

S18 E98: Rachel Weisz, Tony Robbins, Gaslight Anthem

S18 E99: Bill O'Reilly, Adam Shankman, Lyle Lovett

S18 E100: Piers Morgan, Joey King, Jaron and the Long Road to Love

S18 E101: Eva Mendes, Isiah Mustafa, Robert Cray

S18 E102: Jennifer Aniston, Jason Schwartzman, Stone Temple Pilots

S18 E103: Gabourey Sidibe, Jakub Vagner, Mike Vecchione

S18 E104: Sylvester Stallone, Criss Angel, Maronzio Vance

S18 E105: Betty White, Sam Trammell, Black Crowes

S18 E106: Gordon Ramsay, Sofia Vergara, K'naan

S18 E107: Mickey Rourke, Seth MacFarlane, Plain White T's

S18 E108: Emma Thompson, comics from "Chelsea Lately", Taio Cruz

S18 E109: Howie Mandel, Aubrey Plaza, Mike Posner

S18 E110: Anna Kendrick, Eli Roth, Robert Francis

S18 E111: Jason Statham, 92-year-old car lady Rachel Veitch, Los Lobos

S18 E112: Javier Bardem, Paul Watson, Peter Bethune, the Whigs

S18 E113: Justin Long, Alejandro Escovedo

S18 E114: Jason Segel, Jenni J-Wow Farley, Enrique Iglesias

S18 E115: Jennifer Aniston, Jason Schwartzman, Christina Perri

S18 E116: Don Rickles, Dwyane Wade, KISS

S18 E117: Gordon Ramsay, Sofia Vergara, K'Naan

S18 E118: Wanda Sykes, Ben Steinbauer, Jack Rebney, 3OH!3

S18 E119: Don Johnson, Whitney Cummings, Cyndi Lauper & Jonny Lang

S18 E120: Kim Kardashian, Rep. Barney Frank, Norah Jones

S18 E121: Thomas Haden Church, Jules Sylvester, Goo Goo Dolls

S18 E122: Al Michaels, Cris Collinsworth, Steve Buscemi, Herbie Hancock, Susan Tedeschi & Derek Trucks

S18 E123: Louis C.K., Sara Bareilles

S18 E124: Sylvester Stallone, Criss Angel, Maronzio Vance

S18 E125: Carey Mulligan, Meghan McCain, Mavis Staples

S18 E126: Chelsea Handler, Ken Jeong, Ray LaMontagne

S18 E127: Katie Couric, Kurt Warner, David Gray

S18 E128: Hugh Laurie, Emma Stone, Sarah McLachlan

S18 E129: Bill Maher, Kristen Bell, Brandon Flowers

S18 E130: Jamie Lee Curtis, Mike "The Situation" Sorrentino, Trace Adkins

S18 E131: Ben Affleck, Julie Bowen, Weezer

S18 E132: Kate Walsh, Jason Ritter, Santana & India.Arie

S18 E133: Joel McHale, Arianna Huffington, Dov Davidoff

S18 E134: Justin Timberlake, Jane Lynch, OK Go

S18 E135: Ed Helms, Casey Affleck, Sheryl Crow

S18 E136: Ryan Reynolds, Betty White, Tommy Lee

S18 E137: Jimmy Smits, Jackie Evancho, Brian Wilson

S18 E138: Dwyane Wade, Zachary Levi, Gloria Gaynor

S18 E139: Lauren Graham, Vanilla Ice, Zac Brown Band

S18 E140: Patrick Dempsey, Mindy Kaling, Train

S18 E141: Diane Lane, Julie Scardina, Seal

S18 E142: Morgan Freeman, Eric Stonestreet, Rodrigo y Gabriela

S18 E143: Meredith Vieira, Seth MacFarlane, Kenny Chesney

S18 E144: Will Arnett, Dot Marie Jones, a performance from Broadway's "Rock of Ages"

S18 E145: Terrence Howard, Jillian Michaels, K.T. Tunstall

S18 E146: Shaun White, Florence Henderson, Toby Keith

S18 E147: Katherine Heigl, Ben Rappaport, Meat Loaf

S18 E148: Terry Bradshaw, "Potato Lady" Doretta Cannon, OneRepublic

S18 E149: Jay Mohr, Pauly D, Travie McCoy

S18 E150: Heidi Klum, Ty Burrell, Johnny Mathis

S18 E151: Harrison Ford, Whitney Cummings, Gogol Bordello

S18 E152: Wanda Sykes, Rick Fox, Pete Yorn

S18 E153: Eva Longoria Parker, Josh Duhamel, John Legend

S18 E154: Matt Lauer, Martha Stewart, Lauren Pritchard

S18 E155: Robert Downey Jr., Paula Deen, Jamey Johnson

S18 E156: Robin Williams, Judd Apatow, Kylie Minogue

S18 E157: Denzel Washington, Reed Timmer, Corinne Bailey Rae

S18 E158: Rainn Wilson, Margaret Sparkman, Jimmy Eat World

S18 E159: Janet Jackson, Jesse Tyler Ferguson, Duffy

S18 E160: James Franco, Meghan McCain, Far East Movement

S18 E161: Anne Hathaway, San Francisco Giant Brian Wilson, Aaron Neville

S18 E162: Terry Bradshaw, Jennifer Grey, Jason Aldean

S18 E163: Arnold Schwarzenegger, David Baker, N.E.R.D.

S18 E164: Dave Salmoni, Chris Pine, Lee DeWyze

S18 E165: David Spade, Christine O'Donnell, Old 97's

S18 E166: Kim Kardashian, Dennis Miller, Soulja Boy

S18 E167: Diane Keaton, Kevin McHale, Switchfoot

S18 E168: Russell Crowe, Anna Torv, Annie Lennox

S18 E169: Julianne Moore, Tom Felton, Nelly

S18 E170: Christina Aguilera, Buddy Valastro

S18 E171: George W. Bush, Jewel

S18 E172: Garth Brooks, Mike "The Situation" Sorrentino

S18 E173: Dane Cook, Taylor Swift, Keri Hilson

S18 E174: Dwayne Johnson, Kevin Eubanks

S18 E175: Cher, Jeremy Renner, Robyn

S18 E176: Elizabeth Banks, Marjorie Johnson, Carrot Top

S18 E177: Bill Cosby, Atticus Shaffer, Keyshia Cole

S18 E178: Chelsea Handler, Kellan Lutz, Rod Stewart

S18 E179: Mitt Romney, Jay Mohr, Darius Rucker

S18 E180: Jane Fonda, Ian Somerhalder, Paul Reiser & Julia Fordham

S18 E181: Louis C.K., Aron Ralston, Josh Turner

S18 E182: Russell Brand, Chris Colfer, Jonny Lang with Chris Layton, Brad Whitford & Billy Cox

S18 E183: Helen Mirren, Aaron Eckhart, Keith Urban

S18 E184: Jeff Bridges, Rico Rodriguez

S18 E185: Halle Berry, Billy Gardell, Natasha Bedingfield

S18 E186: Matthew Morrison, Crystal Bowersox

S18 E187: Mark Wahlberg, Olivia Wilde, Good Charlotte

S18 E188: Jack Black, Michael Buble

S18 E189: Emily Blunt, Keith Fitzhugh, Jackie Evancho

S18 E190: Jason Segel, Adam Ferrara, Tanner Foust & Rutledge Wood, Katharine McPhee

S18 E191: Owen Wilson, Elle Fanning, Lyle Lovett with Kat Edonson

S18 E192: Larry King, Garrett Hedlund, Pink Martini

S18 E193: Emma Stone, Marjorie Johnson, Sharon Jones & the Dap-Kings

S18 E194: Javier Bardem, Jarod Miller, Naturally 7 with the Agape International Choir

S18 E195: Zachary Levi, Whitney Cummings, BeBe & CeCe Winans with Mary Mary and the West Angeles Choir

S18 E221: Mark Wahlberg, Lachlan Patterson, James Blunt