27 Times a TV Show Swapped Actors and Hoped You Wouldn't Notice

Anita Barone originally appeared as Carol Willick in the second episode of Friends. Looking to pursue a full-time lead role, Barone abruptly left the show, opening the door for Jane Sibbett to play Carol across fifteen memorable episodes.

Lisa Robin Kelly played Eric's mischievous older sister Laurie Forman for three seasons before personal struggles forced her exit. Christina Moore took over for six episodes in Season 6, but the dynamic never quite felt the same.

Creator Mitchell Hurwitz originally planned to recast George Michael's plain girlfriend Ann with a different actress every episode to emphasize how forgettable she was. After Mae Whitman took over the role, her comedic performance proved too perfect to replace.

Lacey Chabert was not fired from Family Guy; she stepped away because of schoolwork and acting commitments on Party of Five. A teenage Mila Kunis auditioned and quickly made Meg's voice an iconic comedic fixture.

Shannon Cochran made a brief appearance as Pam's mother Helene Beesly in Season 2's Sexual Harassment. When the character returned for Pam and Jim's wedding and a romance with Michael Scott in Season 6, veteran actress Linda Purl took over.

A young Shailene Woodley portrayed Marissa Cooper's pony-loving kid sister Kaitlin in Season 1. After the character was shipped off to boarding school, Willa Holland returned in Season 3 as an aged-up, rebellious teenager.

Leonor Varela originated the role of Spanish soap opera star Marta Estrella in early Season 1. Scheduling conflicts led to The Mummy actress Patricia Velasquez stepping in, with Michael Bluth cheekily failing to recognize the swap.

Bobby Draper became one of television's most frequently recast child roles. Across seven seasons, four young actors tackled the part, with Mason Vale Cotton holding down the role longest from Season 5 through the finale.

Baby twins Jaden and Ella Hiller played baby Lily across the first two seasons. When the toddler character required dialogue, Aubrey Anderson-Emmons joined in Season 3, delivering deadpan comedic line reads that stole scenes.

Jazz Raycole played middle daughter Claire Kyle in Season 1. When a storyline involved teenage pregnancy, Raycole's mother pulled her from the show, and Jennifer Freeman took over starting in Season 2 with a joke about looking different.

Ross Butler originated Riverdale's arrogant varsity jock Reggie Mantle in Season 1. When Netflix renewed 13 Reasons Why, Butler could not commit to both shows, allowing Charles Melton to step into the role for the remaining six seasons.

Luke Grimes played brooding vampire James Kent in Season 6. Reports surfaced that creative differences over a same-sex romantic storyline led to Grimes' sudden departure, prompting Nathan Parsons to finish the final season.

After Jake T. Austin departed following Season 2's dramatic car crash finale, future rom-com star Noah Centineo was cast as Jesus Adams Foster, seamlessly taking over the twin brother role through the series conclusion.

Nicole Paggi originated the role of high schooler Sydney Shanowski in Season 1. Producers chose to age down the character's look for Season 2, casting Megan Fox shortly before her breakthrough Hollywood movie stardom.

Lily Nicksay charmed audiences as Cory's cute little sister Morgan across Seasons 1 and 2. After being unseen for an entire season, Lindsay Ridgeway walked into the kitchen in Season 3, cracking a meta joke about a very long timeout.

Beric Dondarrion appeared briefly in Season 1 played by David Michael Scott when Ned Stark dispatched him to arrest Gregor Clegane. When the Brotherhood Without Banners returned in Season 3, Richard Dormer took over with his iconic eyepatch.

British actor Struan Rodger introduced the Three-Eyed Raven in the Season 4 finale cave scene. By Season 6, HBO cast legendary Academy Award nominee Max von Sydow to guide Bran Stark through crucial historical visions.

Callum Wharry appeared as a quiet royal child in early seasons. When Joffrey died and Tommen ascended the Iron Throne with mature political and romantic storylines, Dean-Charles Chapman was cast, having previously played Martyn Lannister.

Conan Stevens played Gregor Clegane in Season 1, followed by Ian Whyte in Season 2. For the legendary trial by combat against Prince Oberyn Martell in Season 4, Icelandic strongman Hafthor Julius Bjornsson took over the terrifying warrior mantle.

Ed Skrein won over Daenerys Targaryen in Season 3 as the flamboyant Tyroshi sellsword Daario Naharis. When Skrein left to star in The Transporter Refueled, Michiel Huisman completely transformed the character's look and demeanor.

When original matriarch Barbara Bel Geddes suffered health complications in 1984, Oscar winner Donna Reed took over as Miss Ellie. When Bel Geddes recovered and returned the next year, Reed sued production over her unceremonious replacement.

Phil Bruns portrayed Jerry's father Morty in Season 1's The Stake Out. Larry David wanted a more cantankerous, abrasive dad energy, recasting Barney Martin, who played Morty for the remainder of the series.

John Randolph played Frank Costanza in Season 4's The Handicap Spot. Larry David later cast Jerry Stiller to bring manic intensity, and the crew went so far as to re-shoot Randolph's original scenes with Stiller for syndication reruns.

Richard Thomas made John-Boy Walton the heart and soul of 1970s television drama. When Thomas chose to leave after five seasons, producers controversially recast Robert Wightman, leaving audiences yearning for the original.

When Lecy Goranson left to attend Vassar College, Sarah Chalke joined as Becky Conner in Season 6. The show leaned heavily into the change with inside fourth-wall jokes, and both actresses even shared the role in Season 8.

Janet Hubert's powerhouse portrayal of Vivian Banks defined early seasons. After contractual disputes and creative friction with Will Smith, Daphne Maxwell Reid took over in Season 4, kicking off one of the most famous recasts in sitcom history.

Dick York's physical comedy made mortal husband Darrin Stephens unforgettable. Crippling chronic back pain forced York to collapse on set and leave in 1969, leading Dick Sargent to step in for the final three seasons without a single in-universe explanation.