4x1 - Alice Eve, Mark Duplass, Wyatt Cenac, Dorothy

September 4, 2018

4x2 - Rob Corddry, Paula Abdul

September 5, 2018

4x3 - Blake Griffin, Paul Feig, Demetri Martin

September 6, 2018

4x4 - Cher, William H. Macy

September 7, 2018

4x5 - Rob Lowe, Leighton Meester, Poppy

September 10, 2018

4x6 - Joe Manganiello, Jennifer Love Hewitt, Why Don't We

September 11, 2018

4x7 - Allison Brie, Keegan-Michael Key, Prof. Robert Winston

September 12, 2018

4x8 - Mel B, Dr. Phil McGraw, Olivia Munn, Good Charlotte

September 13, 2018

4x9 - Tracey Ullman, Henry Golding, Madison Beer

September 18, 2018

4x10 - Kaley Cuoco, Joel McHale, Gaz Coombes

September 19, 2018

4x11 - Joan Collins, Johnny Galecki, Badflower

September 20, 2018

4x12 - Tiffany Haddish, Jay Hernandez, Tori Kelly

September 24, 2018

4x13 - Rupert Everett, Rob Riggle, Ben Howard

September 25, 2018

4x14 - Max Greenfield, Sophie Turner, Josh Groban

September 26, 2018

4x15 - Damon Wayans Jr., Gina Rodriguez, Mark Normand

September 27, 2018

4x16 - Chris Sullivan, Lil Rel Howery, Sabrina Carpenter

October 1, 2018

4x17 - Riz Ahmed, Mary Elizabeth Winstead, Phosphorescent

October 2, 2018

Actor Riz Ahmed (Venom (2018)); actress Mary Elizabeth Winstead (All About Nina (2018)); Phosphorescent perform.

4x18 - Jeff Bridges, Jenny Slate, Arctic Monkeys

October 3, 2018

4x19 - Beth Behrs, Taran Killam, Boy George

October 4, 2018

4x20 - Jon Hamm, Judy Greer

October 15, 2018

4x21 - Keira Knightley, Kathryn Hahn, Joe Zimmerman

October 16, 2018

4x22 - Jamie Lee Curtis, Felix Mallard, Colin Macleod

October 17, 2018

4x23 - Maya Rudolph, Nick Kroll, Rufus Wainwright

October 18, 2018

4x24 - Dakota Johnson, Gordon Ramsay, Mike Posner

October 22, 2018

4x25 - Jamie Dornan, Florence Welch, Florence + The Machine

October 23, 2018

4x26 - Rosamund Pike, Zlatan Ibrahimovic, Snow Patrol

October 24, 2018

4x27 - Amber Stevens West, Randall Park, Lenny Kravitz

October 25, 2018

4x28 - Carey Mulligan, Jenna Fischer

October 29, 2018

4x29 - Greg Kinnear, Katie Hill, Ariana Grande

October 30, 2018

Actor Greg Kinnear ("House of Cards"); congressional candidate Katie Hill; singer/songwriter Ariana Grande;

4x30 - Adam DeVine, Dan Stevens, KISS

October 31, 2018

4x31 - Rami Malek, Joel Edgerton, Mike Shinoda, Barbra Streisand

November 1, 2018

4x32 - Aaron Taylor-Johnson, Richard Madden, KISS, Snow Patrol

November 5, 2018

4x33 - Busy Philipps, Noah Centineo, Derren Brown, Morrissey

November 7, 2018

4x34 - Zoe Kazan, Jack Whitehall, Chloe x Halle

November 8, 2018

4x35 - Octavia Spencer, Jesse Williams, Pentatonix

November 12, 2018

4x36 - Justin Hartley, Dominic West, Elle King, Migos

November 13, 2018

4x37 - Melissa McCarthy, Richard E. Grant, Mark Wahlberg, Ian Karmel

November 14, 2018

4x38 - Maggie Gyllenhaal, Paul Dano, Diego Luna, Dylan Reynolds

November 15, 2018

4x39 - Kurt Russell, Viggo Mortensen, Marc E. Bassy ft. G-Eazy

November 19, 2018

4x40 - Eric Bana, Billie Lourd, Emily Heller

November 20, 2018

4x41 - Michael B. Jordan, Linda Cardellini, Eddie Redmayne, Death Cab for Cutie

November 21, 2018

4x42 - Michael Peña, Andy Serkis, Lauv & Julia Michaels

November 28, 2018

4x43 - Kermit the Frog, Minka Kelly, Peter Krause, Sampha

November 29, 2018

4x44 - Sara Gilbert, Jeff Goldblum

December 3, 2018

4x45 - Zachary Levi, Jake Johnson

December 4, 2018

4x46 - Jude Law, Steve Coogan, Sam Morril

December 5, 2018

4x47 - Jennifer Aniston, Dolly Parton, Leon Bridges

December 6, 2018

4x48 - Sean Hayes, Ice Cube

December 10, 2018

4x49 - Ellen DeGeneres, Patrick Wilson

December 11, 2018

4x50 - Gisele Bündchen, Janelle Monáe, Katherine Ryan

December 12, 2018

4x51 - Julia Roberts, Jason Momoa, Yahya Abdul-Mateen II, She & Him

December 13, 2018

4x52 - Armie Hammer, Amber Heard, Middle Kids, Cardi B

December 17, 2018

4x53 - Pharrell Williams, Gwen Stefani, Lin-Manuel Miranda, Emily Blunt

December 18, 2018

4x54 - Jennifer Lopez, Leah Remini, Black Eyed Peas

December 19, 2018

4x55 - Will Ferrell, RuPaul Charles

December 20, 2018

4x56 - KiKi Layne, John David Washington, Alec Benjamin

January 7, 2019

4x57 - Ken Jeong, Brian Tyree Henry, H.E.R.

January 8, 2019

4x58 - Amy Adams, Tyler Perry, Mekki Leeper

January 9, 2019

James welcomes actress Amy Adams, actor Tyler Perry, and comic Mekki Leeper.

4x59 - Cedric the Entertainer, Ashley Graham, Flatbush Zombies

January 10, 2019

4x60 - Claire Foy, Andie MacDowell, Freya Ridings

January 14, 2019

4x61 - Nina Dobrev, Terry Crews, Jack & Jack

January 15, 2019

4x62 - Cobie Smulders, Sebastian Stan, Joel Kim Booster

January 16, 2019

4x63 - Vanessa Hudgens, Andrew Rannells

January 17, 2019

4x64 - Russell Wilson, Chris Pratt, Elizabeth Banks, Will Arnett

January 20, 2019

4x65 - Stephen Curry, Regina King, Ron Funches, Lauren Jauregui

January 22, 2019

4x66 - Sonequa Martin-Green, Pete Holmes, Rebecca Ferguson, Ava Max

January 23, 2019

4x67 - Neil Patrick Harris, Chelsea Peretti, Adam Newman

January 24, 2019

4x68 - Eric McCormack, Danielle Macdonald, Paige Weldon

January 28, 2019

4x69 - Regina Hall, Eugene Levy, Charlie Day

January 29, 2019

4x70 - Kevin Hart, Stephen James, Phosphorescent

January 30, 2019

4x71 - Laura Dern, Alfonso Cuarón, Beck

February 4, 2019

4x72 - Billy Crystal, Sarah Chalke, Buddy

February 5, 2019

4x73 - Alicia Keys, Hailey Bieber, Joe List

February 6, 2019

4x74 - Matt LeBlanc, Will Arnett, Broods

February 7, 2019

4x75 - Kelsey Grammer, Jay Baruchel, Alessia Cara

February 11, 2019

4x76 - Rebel Wilson, Priyanka Chopra Jonas, Justin Flom

February 12, 2019

4x77 - Courteney Cox, Nick Kroll, Betty Who

February 13, 2019

4x78 - Ray Romano, D'Arcy Carden, Lukas Graham

February 14, 2019

4x79 - Mahershala Ali, Aaron Sorkin, Julia Michaels & Niall Horan

February 18, 2019

4x80 - Elizabeth Warren, 50 Cent, TNT Boys

February 19, 2019

4x81 - Kate Walsh, Stephen Merchant, Natalie Prass

February 20, 2019

4x82 - Kal Penn, Chris O'Dowd, Adam Ferrara

February 21, 2019

4x83 - Nick Jonas, Joe Jonas, Kevin Jonas, Lior Suchard

March 4, 2019

4x84 - Isla Fisher, Chiwetel Ejiofor, Jonas Brothers

March 5, 2019

4x85 - Allison Janney, Samuel L. Jackson, Jonas Brothers

March 6, 2019

4x86 - Cole Sprouse, Dan Levy, Jonas Brothers

March 7, 2019

4x87 - Rita Wilson, Kevin Nealon, Jason Mitchell

March 11, 2019

4x88 - Gordon Ramsay, Piper Perabo, Elle King

March 12, 2019

4x89 - Sharon Osbourne, Sam Richardson, Ryan Conner

March 13, 2019

4x90 - Kate Beckinsale, Milo Ventimiglia, Better Oblivion Community Center

March 14, 2019

4x91 - Adam Scott, Taron Egerton, Miles Kane

March 18, 2019

4x92 - Ben Schwartz, Tim Roth, Leon Bridges

March 19, 2019

4x93 - David Boreanaz, Cam Newton, Daddy Yankee

March 20, 2019

4x94 - Max Greenfield, Maggie Siff

March 25, 2019

4x95 - Kobe Bryant, Cara Delevingne, Tom Walker

March 26, 2019

4x96 - Pamela Adlon, David Harbour, Wallows

March 27, 2019

Pamela Adlon; and David Harbour. Also: Wallows perform.

4x97 - Rachel Bloom, Christopher Meloni, Rita Wilson

April 1, 2019

4x98 - Zach Braff, Ben Platt

April 2, 2019

Zach Braff. Also: Ben Platt performs.

4x99 - Colin Farrell, Woody Harrelson

April 3, 2019

4x100 - Matthew McConaughey, Reba McEntire, Jimmy Buffett

April 4, 2019