S15 E1: Jason Lee, Elton John

S15 E2: Justin Timberlake, Sarah Silverman

S15 E3: Steve Carell, Jamie Lee Curtis, Joan Jett

S15 E4: Teri Hatcher, Jon Heder, Kenny Chesney

S15 E5: Calista Flockhart, Harland Williams, Gomez

S15 E6: Eva Longoria, Cole and Dylan Sprouse, Death Cab for Cutie

S15 E7: Adrien Brody, Chef G. Garvin, Alan Jackson

S15 E8: Evangeline Lilly, Magic Johnson, Diana Krall

S15 E9: Ashton Kutcher, Jenna Fischer, Amos Lee

S15 E10: Jessica Simpson, Bill O'Reilly, Snow Patrol

S15 E11: Wanda Sykes, Chris Matthews, John Mayer

S15 E12: Helen Mirren, B.J. Novak, Jet

S15 E13: Michael Clarke Duncan, Lisa Lampanelli, Rod Stewart

S15 E14: Bob Newhart, Kristin Chenoweth, Camp Freddy

S15 E15: Jarod Miller, Bradley Whitford, Ray LaMontagne

S15 E16: Tina Fey, Annika Sorenstam, Fergie

S15 E17: Tiger Woods, Emeril Lagasse, Chingy

S15 E18: Arnold Schwarzenegger, Heidi Klum, Le Rêve

S15 E19: Sandra Bullock, Michael Caine, Chris Young

S15 E20: David Gregory, Ali Larter, Edie Brickell & The New Bohemians

S15 E21: Hugh Jackman, Tim McGraw

S15 E22: Jennifer Love Hewitt, Tim Burton, Barry Manilow

S15 E23: Annette Bening, Mad Scientist David Willey, Sarah McLachlan

S15 E24: Sally Field, Bug Man Ruud Kleinpaste, Kevin Federline

S15 E25: John Landis & The Spiridellis Brothers, JoJo

S15 E26: Tim Allen, 8-year-old opera singer Gwyn Mackenzie, Carrie Underwood

S15 E27: Roseanne Barr, Sharon Osbourne, Marilyn Manson

S15 E28: Emma Thompson, Spencer Breslin, Regina Spektor

S15 E29: Penelope Cruz, John Stamos, "Weird Al" Yankovic

S15 E30: Russell Crowe, Rachael Ray, Kellie Pickler

S15 E31: Hugh Laurie, America Ferrara, the Cheetah Girls

S15 E32: Courtney Love, Brad Garrett, OK Go

S15 E33: Ellen DeGeneres, Fred Willard, Tony Bennett

S15 E34: Borat, Martha Stewart, Damian Rice

S15 E35: Lindsay Lohan, Emmitt Smith, Army Of Anyone

S15 E36: Sharon Stone, Patricia Arquette, Vince Gill

S15 E37: Rachel Weisz, Nick Cannon, Il Divo

S15 E38: Jaime Pressly, Adventurer Bear Grylls, Cirque du Soleil: The Beatles - LOVE

S15 E39: Emilio Estevez, D.L. Hughley, Josh Groban

S15 E40: Kate Winslet, Wilmer Valderrama, Buddy Guy

S15 E41: Demi Moore, Ron Livingston, Chris Cornell

S15 E42: Denzel Washington, Catherine O'Hara, Jerry Lee Lewis with Kid Rock

S15 E43: Amazing Animals With Julie Scardina, Ellen Pompeo, Nelly Furtado

S15 E44: Howie Mandel, Nelly Furtado

S15 E45: Kristin Davis, Ralphie May

S15 E46: Cameron Diaz, Gwyn Mackenzie, The Wreckers

S15 E47: Lucy Liu, Bob Saget, Snoop Dogg

S15 E48: Al Gore, Karolina Kurkova, Fantasia

S15 E49: Morgan Freeman, Josh Duhamel, Barenaked Ladies

S15 E50: Sen. Barack Obama, Maggie Gyllenhaal, Taylor Hicks

S15 E51: Cate Blanchett, Larry the Cable Guy, Corinne Bailey Rae

S15 E52: Dennis Miller, LaDainian Tomlinson, K.T. Tunstall

S15 E53: Jack Black, Chef G. Garvin, Paulina Rubio

S15 E54: Mel Gibson, Bil Dwyer, Ludacris

S15 E55: Sylvester Stallone, Parminder Nagra, Seal

S15 E56: Former President Jimmy Carter, Edward Norton, Panic! At the Disco

S15 E57: Jamie Foxx, Brad Paisley

S15 E58: Dakota Fanning, Aaron Eckhart, Twisted Sister

S15 E59: Leonardo DiCaprio, Naomi Watts, The Goo Goo Dolls

S15 E60: Tobey Maguire, spider expert Jules Sylvester, Sarah McLachlan

S15 E61: Samuel L. Jackson, Nick Thune, Scott Weiland

S15 E62: Robert De Niro, Jennifer Hudson

S15 E63: Will Smith, Pamela Anderson, Richard Roeper, The Blind Boys of Alabama

S15 E64: Matthew McConaughey, Opie and Anthony, The Killers

S15 E65: Dustin Hoffman, Abigail Breslin, African Children's Choir

S15 E66: George Clooney, Maria Lark, Unwritten Law

S15 E67: Justin Timberlake, Masi Oka, Matisyahu

S15 E68: Hilary Swank, Tom Papa, Akon

S15 E69: Terry Bradshaw, baker Marjorie Johnson, Papa Roach

S15 E70: Kiefer Sutherland, Betty White, Chris Daughtry

S15 E71: Ben Affleck, Chris Leak, Jewel

S15 E72: Sen. John Edwards, Terri Irwin, Mindy Smith

S15 E73: Helen Mirren, Isaac Mizrahi, Los Lonely Boys

S15 E74: Renée Zellweger, Joy Behar, Common

S15 E75: Paula Abdul, D.L. Hughley, Tyrese feat. Lil Jon

S15 E76: Matt Lauer, John & Margaret Ragonese, The All-American Rejects

S15 E77: Meredith Vieira, Ryan Reynolds, Robin Thicke

S15 E78: James Woods, Lisa Lampanelli, Five For Fighting

S15 E79: Don Rickles, John Stamos, Rocco DeLuca & The Burden

S15 E80: Jennifer Garner, Ty Pennington, Bow Wow

S15 E81: Jon Cryer, Jeff Garcia, Switchfoot

S15 E82: Sienna Miller, Phyllis Diller, Branford Marsalis Quartet

S15 E83: Wanda Sykes, Sendhil Ramamurthy, The Bird And The Bee

S15 E84: Rebecca Romijn, Bob Saget, Rodrigo Y Gabriela

S15 E85: Bill Cosby, Mary Lynn Rajskub, Katharine McPhee

S15 E86: Diane Keaton, Ivanka Trump, The Soweto Gospel Choir

S15 E87: Forest Whitaker, America Ferrera, Daniel Powter

S15 E88: Abigail Breslin, Amazing Animals With Julie Scardina, Christina Aguilera

S15 E89: Cuba Gooding Jr., Miss USA Tara Conner, The Game

S15 E90: Clint Eastwood, Jennifer Hudson, John Waite and Alison Krauss

S15 E91: Penelope Cruz, Tyler Perry, James Hunter

S15 E92: Hugh Grant, Himalayan Bears With Julie Scardina, Norah Jones

S15 E93: Mark Wahlberg, Sarah Silverman, Mat Kearney

S15 E94: Drew Barrymore, Kyle Krichbaum, Solomon Burke

S15 E95: Nicolas Cage, D.J. Sampson & Sam Ballerini, The Fray

S15 E96: Dennis Miller, baker Marjorie Johnson, Taylor Swift

S15 E97: Beyoncé, Charles Barkley, Kenny Wayne Shepherd

S15 E98: Jim Carrey, Gov. Tom Vilsack, Dustin Kensrue

S15 E99: Teri Hatcher, Rhys Ifans, Omarion

S15 E100: Simon Cowell, Randy Jackson & Ryan Seacrest, Tiki Barber, Silversun Pickups

S15 E101: Bill Maher, skydiving accident survivor Michael Holmes, Rodney Atkins

S15 E102: Jaime Pressly, Gordon Ramsay, Gomez

S15 E103: Peter O'Toole, Christina Ricci, Hellogoodbye

S15 E104: Animals With Joan Embery, William H. Macy, John Mellencamp

S15 E105: Courteney Cox, Richard Roeper, Plain White Ts

S15 E106: John Travolta, Katt Williams, Everclear

S15 E107: Tim Allen, Hollywood's Most Talented Animals, Fergie

S15 E108: Howie Mandel, Chris Hansen, Korn

S15 E109: Queen Latifah, Gerard Butler, Buckcherry

S15 E110: Mark Wahlberg, Brad Garrett, My Chemical Romance

S15 E111: Sandra Bullock, Andy Richter, Evanescence

S15 E112: Minnie Driver, Bailee Madison, Finger Eleven

S15 E113: Dan Rather, bizarre food expert Andrew Zimmern, Lloyd

S15 E114: Terry Bradshaw, Mary Lynn Rajskub, Musiq Soulchild

S15 E115: Terrence Howard, Bruce Fine, the cast of "Jersey Boys"

S15 E116: David Spade, Richard Engel, Hinder

S15 E117: Roseanne Barr, Heather Mills, James Morrison

S15 E118: Will Ferrell, Sen. Joseph Biden, Paolo Nutini

S15 E119: Nick Nolte, bug expert Rudd Kleinpaste, Guster

S15 E120: Quentin Tarantino, Pete Rose, Mika

S15 E121: Jeff Foxworthy, Charlie Engle, Kevin Lin & Ray Zahab, Dierks Bentley

S15 E122: Hilary Swank, Carlos Mencia, Gym Class Heroes

S15 E123: Campbell Brown, Will Arnett, Dave Koz feat. Johnny Mathis

S15 E124: Amy Poehler, Ricky Schroder, Ozomatli

S15 E125: Kurt Russell, Shia LaBeouf, Hilary Duff

S15 E126: Gerard Butler, Tim McGraw

S15 E127: Jennifer Love Hewitt, Brandi Carlile

S15 E128: Craig T. Nelson, Molly Shannon, Sick Puppies

S15 E129: Jeremy Piven, Jenna Fischer, John Legend

S15 E130: Anthony Hopkins, Rose McGowan, Good Charlotte

S15 E131: Jamie Lee Curtis, Jonathan Rhys-Meyers, Patty Griffin

S15 E132: Wanda Sykes, Jesse James, Rickie Lee Jones

S15 E133: Julia Louis-Dreyfus, Rep. Nancy Pelosi, Relient K

S15 E134: Rainn Wilson, Orny Adams, The Shins

S15 E135: Luke Wilson, Alexandra Wentworth, Lily Allen

S15 E136: Tim Russert, Eddie Izzard, Three Days Grace

S15 E137: Tobey Maguire, Tori Spelling, Wicked

S15 E138: Jack Black, Sanjaya, OK Go

S15 E139: Kevin Bacon, Hayden Panettiere, Michael Phelps

S15 E140: Zach Braff, Pat Summitt, Joss Stone

S15 E141: Bill Maher, Sig & Edgar Hansen, Amy Winehouse

S15 E142: Leah Remini, Adam Brody, Mavis Staples

S15 E143: Jarod Miller, Kiefer Sutherland, Macy Gray feat. Natalie Cole

S15 E144: Conan O'Brien, Venus Ramey, Kings of Leon

S15 E145: Eric Bana, Oscar De La Hoya, Kaiser Chiefs

S15 E146: Dr. Phil McGraw, Rove McManus, Patti Smith

S15 E147: Mitt Romney, D.L. Hughley, Fall Out Boy

S15 E148: Howie Mandel, Bryce Howard, Alan Jackson

S15 E149: Thomas Haden Church, 102-year-old golfer Elsie McLean, Ne-Yo

S15 E150: Mike Myers, Floyd Mayweather, The Cat Empire

S15 E151: Matthew Fox, Larry the Cable Guy, Feist

S15 E152: Antonio Banderas, Brady Barr, Aqualung

S15 E153: Cameron Diaz, 6-year-old piano prodigy Ethan Bortnick, Nelly Furtado

S15 E154: Amazing Animals With Julie Scardina, Gov. Bill Richardson, Miranda Lambert

S15 E155: Dominic Monaghan, "American Idol" finalists Melinda Doolittle, Blake Lewis & Jordin Sparks, Taylor Hicks

S15 E156: Orlando Bloom, Maria Lark, Gym Class Heroes

S15 E157: Ricki Lake, baker Marjorie Johnson, Gretchen Wilson

S15 E158: Felicity Huffman, bizarre food expert Andrew Zimmern, Dolores O'Riordan

S15 E159: Jamie Foxx, Jimmy Fallon, Peter Bjorn And John

S15 E160: Simon Cowell, 95-year-old college graduate Nola Ochs, Maroon 5

S15 E161: Demi Moore, Judd Apatow, Angelique Kidjo feat. Ziggy Marley

S15 E162: Gov. Arnold Schwarzenegger, Debra Messing, Fiction Plane

S15 E163: Kevin Costner, "American Idol" winner Jordin Sparks, Daniel Tosh

S15 E164: Dennis Miller, Ross "The Intern" Mathews, Dwight Yoakam

S15 E165: Jessica Alba, Seth Rogen, Lucinda Williams

S15 E166: George Clooney, senior-citizen band the Zimmers, Rihanna

S15 E167: Bernie Mac, Cat Deeley, Chris Cornell

S15 E168: Don Rickles, Josh Flitter, Dashboard Confessional

S15 E169: Steve Carell, Kenny Smith, The Goo Goo Dolls

S15 E170: Wanda Sykes, Mathias Sisters, John Mayer

S15 E171: Fred Thompson, Lauren Graham, Toby Keith

S15 E172: Terry Bradshaw, Shia LaBeouf, James Morrison

S15 E173: Téa Leoni, Joy Behar, Bloc Party

S15 E174: Bill Cosby, Charlie Gilpin, Aspen Nelson & Bryant Ashton, Avril Lavigne

S15 E175: Robin Williams, Chelsea Handler, Big & Rich

S15 E176: Michael Chiklis, Bruce Bowen, Sugarland

S15 E177: Samuel L. Jackson, 17-year-old reptile expert Corbin Maxey, Jesse Malin

S15 E178: John Cusack, Tavis Smiley, Lifehouse

S15 E179: Cedric the Entertainer, Chip Foose, Kelly Clarkson

S15 E180: John & Elizabeth Edwards, Maz Jobrani, The Red Jumpsuit Apparatus

S15 E181: Michael Moore, Justin Long, Mandy Moore

S15 E182: Josh Duhamel, David Willey, Jason Aldean

S15 E183: Dr. Phil McGraw, Leslie Mann, Velvet Revolver

S15 E184: Ethan Hawke, Carlos Mencia, Breaking Benjamin

S15 E185: Daniel Radcliffe, Patton Oswalt, The Decemberists

S15 E186: Adam Sandler, Nikki Blonsky, Silverchair

S15 E187: John Travolta, Tony Dungy, The Neville Brothers

S15 E188: Jessica Biel, Bill Engvall, T-Pain feat. Yung Joc

S15 E190: Bill Maher, Minnie Driver

S15 E191: Holly Hunter, Kent Couch, Ryan Adams & The Cardinals

S15 E192: Sandra Bullock, Chris Matthews, Suzanne Vega

S15 E193: Don Cheadle, Miley Cyrus, Puddle of Mudd

S15 E194: Glenn Close, Sebastian Manisalco, Marilyn Manson

S15 E195: Amazing Animals With Julie Scardina, Aaron Eckhart, Common

S15 E196: Rob Schneider as Lindsay Lohan, Rove McManus, Sum 41

S15 E197: Matt Damon, George Foreman, Stephen Stills

S15 E198: Michael Moore, Orny Adams, Perry Farrell's Satellite Party

S15 E199: Kevin James, Arctic swimmer Lewis Pugh, Katharine McPhee

S15 E200: Jennifer Lopez, Kevin Nealon, Glen Hansard & Markéta Irglová

S15 E201: Chris Tucker, Marc Anthony, The John Butler Trio

S15 E202: Heidi Klum, Anderson Cooper, Brad Paisley

S15 E203: Claire Danes, Bob Saget, Grace Potter & The Nocturnals

S15 E204: Hank Azaria, David Hasselhoff, Sharon Osbourne & Piers Morgan, Daddy Yankee

S15 E205: Michelle Pfeiffer, Jonah Hill, MIMS

S15 E206: Cuba Gooding Jr., Zac Efron, John McLaughlin

S15 E207: Seth Rogen, animal trainer Jules Sylvester, Hot Hot Heat

S15 E208: David Duchovny, Tiki Barber, Nick Thune

S15 E209: Rainn Wilson, Gordon Ramsay, Fuel

S15 E210: Drew Carey, Richard Roeper, Colbie Caillat

S15 E211: Sen. John McCain, Bill Hader, Ben Harper and the Innocent Criminals

S15 E212: Jeff Foxworthy, Maria Lark, Mat Kearney

S15 E213: Jonah Hill, Michael Cera, Christopher Mintz-Plasse, Jarod Miller, Wilco

S15 E214: Seth Green, Mike Rowe, Collective Soul

S15 E215: Dennis Miller, Capt. Ed Kiesel, Rodrigo Y Gabriela

S15 E216: Fred Thompson, Jerome Bettis, Travis Tritt

S15 E217: Daniel Radcliffe, Mark Cuban, Kings of Leon

S15 E218: Show# 3431

S15 E219: Brad Garrett, Funny Car racer Ashley Force, Cirque du Soleil

S15 E220: Denis Leary, Robert Klein, Spoon

S15 E221: Kelsey Grammer, Dan Fogler, The Bravery

S15 E222: Terry Bradshaw, Vanessa Hudgens, Michael Buble

S15 E223: Michael Douglas, Tavis Smiley, Good Charlotte