18 TV Shows That Replaced Their Entire Cast After Season One

Some of these shows really did start over with a brand-new generation of faces, while others lost the people who made season one feel like season one.

The way each one survived the shake-up is stranger than you’d expect.

1. Doctor Who: The Original TARDIS Crew Was Gone Within Three Years

When Patrick Troughton became the Doctor in 1966, none of the original travelers were left. William Hartnell handed over the role, Carole Ann Ford’s Susan left in 1964, and William Russell’s Ian and Jacqueline Hill’s Barbara left in 1965.

The reset was gradual, but it became the show’s survival trick. It ran until 1989, returned in 2005, and is still going.

2. Law & Order: Season One’s Cast Never Stood a Chance

Season one featured George Dzundza and Chris Noth, with Michael Moriarty leading the prosecution. Dzundza was gone after one season, replaced by Paul Sorvino.

The show kept swapping partners and prosecutors for two decades. Steven Hill, who joined in season two, became the long-running anchor before leaving after season 10. The series ran 20 seasons on the idea that nobody was irreplaceable.

3. ER: The Big Names Walked Out of the Emergency Room

County General’s first lineup included George Clooney, Anthony Edwards, Sherry Stringfield, Julianna Margulies, Noah Wyle and Eriq La Salle. It didn’t last.

Over 15 seasons, the headline stars all eventually left and new doctors took their places. Wyle even returned for the final season, giving the drama one last glimpse of where it began.

4. Skins: A Clean Break Built Into the Show

This is the closest thing on the list to a true reset. The first group, including Nicholas Hoult as Tony and Dev Patel as Anwar, wrapped up after two series.

A second generation, with Kaya Scodelario’s Effy and Jack O’Connell’s Cook at the center, took over, and a third followed. The UK series ran six series before a final send-off in 2013.

At a Glance

• Generation one: series 1 and 2, with Tony and Anwar
• Generation two: series 3 and 4, with Effy and Cook up front
• Generation three: series 5 and 6, with a new set of students
• The pattern: a fresh group every two series, by design

5. Misfits: The Original Offenders Vanished One by One

The first band of community service misfits didn’t last. Robert Sheehan’s Nathan left after series two, and Antonia Thomas and Lauren Socha followed after series three.

Newcomers including Joseph Gilgun’s Rudy, Karla Crome, Natasha O’Keeffe and Matt Stokoe filled the gaps. By the end of its five-series run, the show looked very little like the one that debuted in 2009.

6. Degrassi: The Next Generation: Students Graduate, the Show Doesn’t

Degrassi works like a real school: students graduate and new freshmen arrive. Aubrey Graham, now known as Drake, played Jimmy Brooks before the early cast moved on.

Stefan Brogren’s Snake Simpson is the one face across all 14 seasons, a former student turned teacher and eventually principal. The franchise later continued as Degrassi: Next Class.

7. Being Human (UK): The Original Roommates Moved Out

The first house share was a vampire, a werewolf and a ghost. Aidan Turner’s Mitchell left after series three, then Russell Tovey’s George and Lenora Crichlow’s Annie left after series four.

Series five handed the house to Michael Socha’s Tom, Damien Molony’s Hal and Kate Bracken’s Alex. The show ended there, after five series.

8. New Tricks: Three of the Four Cold-Case Veterans Were Replaced

The core team was James Bolam, Alun Armstrong, Amanda Redman and Dennis Waterman. Over time, Armstrong, Bolam and Redman each left and were replaced by Denis Lawson, Nicholas Lyndhurst and Tamzin Outhwaite.

Waterman stayed to the end, so it wasn’t a total wipeout. Still, the unit that made the show a hit looked very different by the time the procedural ended after 12 series.

9. The Crown: A Royal Cast Swap Planned From Day One

This one was deliberate. Claire Foy’s Elizabeth and Matt Smith’s Philip gave way to Olivia Colman and Tobias Menzies, who then passed the roles to Imelda Staunton and Jonathan Pryce.

Even Vanessa Kirby’s Margaret went to Helena Bonham Carter, then Lesley Manville. Every two seasons, the whole principal ensemble aged out. The Crown ran six seasons, ending in 2023.

Quick Compare

• Seasons 1 and 2: Claire Foy (Elizabeth), Matt Smith (Philip), Vanessa Kirby (Margaret)
• Seasons 3 and 4: Olivia Colman, Tobias Menzies, Helena Bonham Carter
• Seasons 5 and 6: Imelda Staunton, Jonathan Pryce, Lesley Manville

10. Grey’s Anatomy: The Original Interns Slowly Disappeared

Season one’s crowd of surgical interns has thinned dramatically. Sandra Oh left after season 10, Patrick Dempsey after season 11, and Justin Chambers in season 16.

Ellen Pompeo, Chandra Wilson and James Pickens Jr. stayed far longer than most. Meanwhile, new residents kept arriving, and the series has now run more than 20 seasons.

11. Once Upon a Time: The Fairy Tale That Rebooted Itself

Characters came and went all along. Season seven was the real shake-up, a soft reboot that centered an adult Henry, played by Jared Gilmore.

Andrew J. West, Dania Ramirez, Gabrielle Anwar and Mekia Cox joined him, while Ginnifer Goodwin and Josh Dallas had left. Lana Parrilla and Robert Carlyle stayed, so it wasn’t a total wipeout. The show ended after seven seasons in 2018.

12. Cheers: The Heart of the Bar Walked Out

Shelley Long’s Diane Chambers left after season five, which looked like a fatal blow to the will-they-won’t-they at the center of the show.

Kirstie Alley arrived as Rebecca Howe, and Ted Danson stayed on as Sam. It was one major swap, not a full overhaul, yet the show thrived and ran 11 seasons.

Why It Stands Out

• It lost half of its central love story and kept going
• Rebecca Howe was a new kind of foil for Sam, not a copy of Diane
• Danson’s Sam anchored the bar through the transition
• The comedy ran 11 seasons in total

13. The Walking Dead: The Man Who Led the Survivors Left

Andrew Lincoln’s Rick Grimes was the face of the show, and he exited early in season nine.

The story shifted toward the remaining survivors, with Norman Reedus, Melissa McBride and Lauren Cohan keeping it going. The series ran 11 seasons, and spinoffs kept the universe alive.

14. Charmed: One Sister Died, Another Took Her Place

Shannen Doherty’s Prue was killed off at the end of season three, ending her run as the eldest Halliwell sister.

Rose McGowan joined in season four as half-sister Paige, with Holly Marie Combs and Alyssa Milano still on board. The adjusted trio carried the show through eight seasons.

15. Two and a Half Men: The Star Was Written Out, Then Replaced

Charlie Sheen’s Charlie Harper left after season eight, and the show killed his character off.

Ashton Kutcher arrived as Walden Schmidt, while Jon Cryer and Angus T. Jones stayed. The sitcom kept going and ended after 12 seasons in 2015.

16. Spartacus: A Hero Replaced Because of a Real-Life Battle

Andy Whitfield, the first Spartacus, stepped aside after being diagnosed with non-Hodgkin lymphoma. He died in September 2011.

Liam McIntyre took over the role for the sequel season, while much of the supporting cast, including Lucy Lawless and Manu Bennett, stayed. The series wrapped up its planned run in 2013.

Worth Knowing

• Whitfield led the first season, Blood and Sand
• A prequel miniseries, Gods of the Arena, aired in 2011
• McIntyre led the following seasons, Vengeance and War of the Damned
• Lawless and Bennett carried the story across the change

17. Batwoman: The Hero Vanished After Season One

Ruby Rose’s Kate Kane exited after season one, and the show kept the Batwoman mantle alive.

Javicia Leslie arrived as Ryan Wilder, who took up the cowl in season two. Much of the supporting cast stayed. The series ended after three seasons.

18. Lethal Weapon: A Partnership Broke Up Mid-Run

Clayne Crawford’s Martin Riggs exited after season two. Seann William Scott stepped in for season three as a new partner for Damon Wayans’ Murtaugh.

Scott played a different character, Wesley Cole, not Riggs. The buddy cop show ended after three seasons.

Only a few of these shows truly started from scratch. Most lost the faces that defined them and had to convince viewers to follow along.

The ones that lasted had one thing in common: they gave audiences a reason to care about whoever walked through the door next. Think we missed one? Tell us which show’s big shake-up you still can’t forget.