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Guest Stars

Stephen Colbert Josh Hartnett Jamie Lee Curtis John Cena Will Poulter Jon Bernthal Allison Janney Ray Romano Brian Baumgartner Patton Oswalt Timothy Olyphant Cameos Christoph Waltz Ron Howard Helen Hunt Christina Hendricks Christopher Lloyd George Wallace Tony Goldwyn Nicola Coughlan Niamh Blackshaw Mariska Hargitay Notable Collaborations Connor Tomlinson Laura Vandervoort Porsha Williams Molly Bernard Brittany Allen Kate Siegel Cariad Lloyd Hayley Atwell Amy Sedaris Only Murders in the Building Cheri Oteri Meryl Streep Olivia Colman Ace Bhatti Ashley Jensen Kevin Costner Scarlett Alice Johnson Hermione Norris Sasha Desouza-Willock John Stamos Paul Giamatti Jodie Whittaker Sean Delaney John Hollingworth Hollywood A-listers Viewer Familiarity Siobhan Finneran Jean Smart Spencer Pratt Michael J. Fox Ariel D. King Morgan Fairchild Louis Davison Maxine Finch Steffan Rhodri Sarah Hadland Rishi Nair Episode 3 John Wheeler David Tennant Amy Madigan Steve Buscemi Character Development Jerry Seinfeld John Oliver Denise Welch Denis Mandel Alistair McGowan Doctor Who Dick Van Dyke

Tamera Mowry-Housley Joins Scrubs Revival as Dr. Steffie

The guest casting places a familiar sitcom and Hallmark star into the two-episode Sept. 30 premiere to help spotlight the series’ new generation of doctors.

Peter Capaldi Joins Only Murders in the Building Season 6

John Oliver Joins Days of Our Lives in Three-Episode Peacock Arc

Henry Winkler Says One Guest Star Bragged About Fan Mail on Happy Days Set

Larry David's New HBO Sketch Series Reimagines U.S. History

Tales From the Crypt Streams for the First Time on Shudder

Christopher Lloyd, Carol Kane and Cheri Oteri Join Happy's Place Season 2, Premiering Nov. 7 on NBC

Stephen Colbert to Play Fictional Late-Night Host in Elsbeth Season 3 Premiere

Porsha Williams, Molly Bernard, Connor Tomlinson and Laura Vandervoort Join 'Brilliant Minds' Season 2