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Every new TV season brings new shows with new stars — and sometimes old shows with new stars, too. It's not uncommon for series to introduce a few fresh faces between seasons, especially if they're also saying goodbye to some familiar names. Click through to see some of the most notable cast shake-ups of the 2018 fall TV season. (Photos via Mathieu Young/Fox + Matt Winkelmeyer/Getty for dcp + Elizabeth Morris/NBC + Jordon Nuttall/The CW)
Leaving 9-1-1: Connie Britton, who played 911 operator Abby Clark in season 1 of Fox's rescue drama, will not return for season 2. (Photo via Mathieu Young/Fox)
Joining 9-1-1: Jennifer Love Hewitt will join the season 2 cast as 911 operator Maddie Kendall, filling the void left by departing star Connie Britton. (Photo via Mathieu Young/Fox)
Joining 9-1-1:Notorious actor Ryan Guzman will play firefighter Eddie Diaz in season 2 of the Fox series. (Photo via Michael Becker/Fox)
Leaving Arrow: Willa Holland, who played Oliver Queen's sister Thea, AKA Speedy, was written off of Arrow toward the end of season 6. She will not return in the upcoming seventh season. (Photo via Diyah Pera/The CW)
Leaving Arrow: Paul Blackthorne, who starred as Quentin Lance on the CW's vigilante superhero series, will not return in season 7. His character was — spoiler! — killed off at the end of season 6. (Photo via Jack Rowand/The CW)
Joining Arrow: Colton Haynes is rejoining Arrow as a series regular in season 7, after leaving the CW/DC show at the end of season 3 and then returning for an arc in season 6. He'll reprise his role as Roy Harper, AKA Arsenal. (Photo via Cate Cameron/The CW)
Leaving Bull: Annabelle Attanasio, who played Cable McCrory on the first two seasons of Bull, will not return for the upcoming third season. She exited the show to pursue an opportunity to direct her first feature film. (Photo via Jojo Whilden/CBS)
Leaving Chicago Fire: Monica Raymund, who played main character Gabriela Dawson on seasons 1 through 6 of the NBC rescue drama, announced in May that she would not be returning for season 7. (Photo via Elizabeth Morris/NBC)
Leaving Chicago P.D.: Elias Koteas, AKA Alvin Olinsky on Chicago P.D., said goodbye to the show at the end of season 5. His character was — spoiler! — killed off in the May finale. (Photo via Matt Dinerstein/NBC)
Joining Crazy Ex-Girlfriend:Pitch Perfect alum Skylar Astin is joining the fourth and final season of Crazy Ex-Girlfriend in a role that will be very familiar to fans of the musical dramedy. Astin is playing Greg Serrano, a character previously played by Santino Fontana. But don't worry — the recasting, or "reimagining," is part of the story. Series star Rachel Bloom has said that it's meant to be a statement about how our perception of people changes over time. (Photo via Matt Winkelmeyer/Getty)
Leaving DC's Legends of Tomorrow: Keiynan Lonsdale announced in June that he would not be returning as a series regular on either Legends of Tomorrow or The Flash. He did say, though, that Wally West, AKA Kid Flash, might still pop up from time to time. (Photo via Robert Falconer/The CW)
Joining DC's Legends of Tomorrow:Santa Clarita Diet's Ramona Young has been cast in the series regular role of Alaska Yu on season 4 of the CW/DC show. (Photo via Christopher Polk/Getty)
Leaving Dynasty: Nathalie Kelley, who played Cristal Flores on the CW's soapy Dynasty reboot, shocked fans when she revealed in June that she would not be returning for season 2. It's unclear what that means for her character, but season 1 ended with — spoiler! — Claudia shooting Cristal and leaving her for dead in the lodge, which someone set on fire. (Photo via Mark Hill/The CW)
Joining Dynasty: Nathalie Kelley may be leaving Dynasty, but Cristal — the "real" Cristal, that is — will be very present in season 2 of the CW drama. Telenovela star Ana Brenda Contreras is set to join the cast as Cristal 2.0, which suggests that Kelley's character may not have been who she said she was. (Photo via Ian Gavan/Getty for Jaeger-LeCoultre)
Leaving The Good Doctor: Chukuma Modu will not return for season 2 of The Good Doctor. His character, Dr. Jared Kalu, received a job offer in Denver at the end of season 1. (Photo via ABC/Bob D'Amico)
Leaving Grey's Anatomy: Sarah Drew's Grey's character, Dr. April Kepner, was written off of the show at the end of season 14. (Photo via ABC/Bob D'Amico)
Leaving Grey's Anatomy: Jessica Capshaw, who first joined Grey's way back in season 5, will not return as Dr. Arizona Robbins in season 15. Like Drew, she was written out of the show at the end of season 14. (Photo via ABC/Bob D'Amico)
Joining Grey's Anatomy: Kim Raver is set to rejoin the Grey's Anatomy crew as cardiothoracic surgeon Teddy Altman. After appearing as a series regular on the Shonda Rhimes medical drama for seasons 6 through 8, Raver returned in a guest-starring capacity in season 14. During the finale in May, Teddy — spoiler! — accepted the job of interim chief of surgery and revealed that she's pregnant, possibly with Owen's baby. (Photo via ABC/Richard Cartwright)
Joining Grey's Anatomy:Nashville actor Chris Carmack is set to play a recurring role in season 15 of the long-running ABC medical drama. His character is described as an "ortho god" who comes to work at Grey Sloan Memorial Hospital. (Photo via Mike Lawrie/Getty)
Joining How to Get Away With Murder: Timothy Hutton will be a series regular on the upcoming fifth season of Shonda Rhimes' HTGAWM, but the details of his role are being kept tightly under wraps. (Photo via Frederick M. Brown/Getty)
Joining Lethal Weapon: Seann William Scott is taking over as Damon Wayans' costar following the departure of Clayne Crawford, who exited the series amid reports of bad on-set behavior. Scott will play a new character who's partnered with Wayans' Roger Murtaugh. (Photo via Peter Yang/Fox)
Leaving NCIS: Pauley Perrette said goodbye to NCIS in May, after 15 seasons as Abby Sciuto. She will not return for the upcoming 16th season. (Photo via Patrick McElhenney/CBS)
Leaving The Resident: Melina Kanakaredes, who played shady oncologist Dr. Lane Hunter on The Resident, will not return in season 2. Her character was — spoiler! — arrested at the end of season 1, after it was revealed that she had been making her patients sicker for profit. (Photo via Justin Stephens/Fox)
Leaving The Resident: Merrin Dungey won't return for season 2 of the Fox medical drama either. Her character, Chastain Park Memorial CEO Claire Thorpe, was removed from her position toward the end of season 1. Dungey already has another gig lined up, though, on the midseason drama The Fix. (Photo via Justin Stephens/Fox)
Leaving The Resident: Like Melina Kanakaredes and Merrin Dungey, Moran Atias will not return for season 2 of The Resident. Atias played Chastain Park Memorial head of publicity Renata Morali. (Photo via Justin Stephens/Fox)
Joining The Resident: Season 2 of the Fox drama will feature Jenna Dewan in the recurring role of Julian Lynn, a "sharp and sophisticated" dancer-turned-medical device rep who begins to discover the "shadier" side of her profession, presumably through her work with Chastain Park Memorial. (Photo via Matt Winkelmeyer/Getty for dcp)
Joining The Resident:Frasier alum Jane Leeves is joining season 2 as Dr. Kit Voss, a star orthopedic surgeon who catches Dr. Bell's eye and butts heads with Malcolm-Jamal Warner's character, AJ Austin. (Photo via David Livingston/Getty)
Joining Station 19: Boris Kodjoe, who most recently appeared on CBS' Code Black, will have a recurring role on season 2 of Shonda Rhimes' Grey's Anatomy spinoff. His character is described as a "seasoned firefighter with a mysterious past." (Photo via Matt Winkelmeyer/Getty)
Leaving Supergirl: Chris Wood, who played Mon-El in seasons 2 and 3 of Supergirl will not return for season 4. (Photo via Katie Yu/The CW)
Leaving Supergirl: Jeremy Jordan, who has played tech wiz Winn Schott since season 1 of Supergirl, will not return as a series regular for season 4. Jordan has said, however, that he may appear in a recurring capacity. (Photo via Katie Yu/The CW)
Joining Supergirl:Nicole Maines is joining season 4 of Supergirl in a historic role. She'll play TV's first transgender superhero, a character named Nia Nal, AKA Dreamer. (Photo via Rich Polk/Getty for IMDb)
Joining Supergirl: April Parker Jones is joining season 4 of Supergirl as a series regular. She'll play Colonel Haley, a "career military woman who lives and dies by the orders of her commanding officers." (Photo via Marcus Ingram/Getty)
Joining Supergirl: Sam Witwer, best known to superhero fans as Doomsday on Smallville, will be a series regular on season 4 of Supergirl. He'll play Agent Liberty, the founder of an anti-alien hate group called Children of Liberty. (Photo via Greg Doherty/Getty)
Joining This Is Us: Michael Angarano has been cast as Jack's brother Nicky on season 3 of NBC's tear-jerking drama, which will chronicle the siblings' experience as soldiers in the Vietnam War, and the mysterious circumstances surrounding Nicky's death. (Photo via Cindy Ord/Getty for SCAD)
