It's not unusual for a TV series to feature different actors than the ones cast in the original pilot, since casting can be reconsidered once the series has scored an order. But casting changes can also happen in the middle of the show, and they are not always acknowledged by the script. Some TV series have been running for so long that parts require a recast, while others see their actors brutally leave because they've moved onto other projects.
These 10 series have had different actors step into the same role, sometimes even alternating between two actors when the first one decided to make a comeback.
1. Laurie Forman, 'That '70s Show'
There was little explanation for Lisa Robin Kelly's replacement by Christina Moore in the role of Laurie Forman on That '70s Show. While Kelly played Laurie from 1998 to 2003, Moore stepped into the role for only six episodes of Season 6.
2. Ann Veal, 'Arrested Development'
Before Arrested Development's Ann Veal was played by Mae Whitman, it was actually Alessandra Torresani who introduced the character to the show, making her first appearance in the "Let 'Em Eat Cake" episode.
3. Kaitlin Cooper, 'The O.C.'
We now know Shailene Woodley as a YA movie star thanks to the Divergent series, but back in 2003, she briefly played Kaitlin Cooper in the first season of The O.C. While the character wasn't present in the show's second season, it was Willa Holland who took over the role in 2006 for Seasons 3 and 4.
4. Daario Naharis, 'Game Of Thrones'
Ed Skrein, who portrayed Daenerys's soldier in Season 3 of Game Of Thrones, reportedly left the show to star in The Transporter Refueled. He was replaced by Michiel Huisman for the following episodes.
5. Morgan Matthews, 'Boy Meets World'
Boy Meets World, which ran from 1993 to 2000, had Lily Nicksay play the role of Morgan Matthews, the little sister of main character Cory Matthews, for the first two seasons. Morgan wasn't present at the beginning of the third season, but when she returned, she was played by Lindsay Ridgeway. The show acknowledged the replacement with Cory saying "Morgan, long time no see!"
6. Vivian Banks, 'The Fresh Prince Of Bel-Air'
The Fresh Prince Of Bel-Air's Aunt Viv was portrayed by Janet Hubert from 1990 to 1993, but rumors of a clash between Hubert and the show's main actor, Will Smith, led to her replacement in the fourth season. Daphne Maxwell Reid took over for the following three years, until the show ended in 1996.
7. Lionel Jefferson, 'The Jeffersons'
George and Louise's son on The Jeffersons was portrayed by D'Urville Martin in two unaired pilots, before Mike Evans and Damon Evans stepped in for the role. The former played Lionel in Season 1 as well as Seasons 6 to 11, while the latter was present from Season 2 to Season 4.
8. Becky Conner, 'Roseanne'
One of the most complicated re-castings is probably the one for the part of Becky Conner in '90s hit Roseanne. When the show started in 1988, Lecy Goranson took the part of Becky until 1993, when she was replaced by Sarah Chalke for Season 6. But when Chalke left in 1995, Goranson came back... until Chalke handled the end of the role from May 1996 to May 1997.
9. Miss. Ellie Ewing, 'Dallas'
Miss. Ellie Ewing was a bit of a confusing character on CBS's Dallas, as she was played by Barbara Bel Geddes from 1978 to 1984 and then again from 1985 to 1990. But during the show's eighth season, between 1984 and 1985, it was Donna Reed who had the role.
10. Darrin Stephens, 'Bewitched'
Bewitched, the story of Samantha the witch marrying Darrin Stephens the adman, ran from 1964 to 1972. But the character of Darrin was played by two different actors: first by Dick York for the first five seasons, then by Dick Sargent from the Season 6 premiere to the end of the show.