Sometimes, due to "creative differences" (Hollywood speak for being an asshole) or for other varied reasons, actors are no longer able to continue portraying a character that they originated. TV and film producers are then forced to re-cast their characters and hope that no one will notice. People do. Every time. Here are 10 such re-cast characters that made viewers go, "Who the hell is that person supposed to be?"

1. Lily, Modern Family

Now Lily can do things like converse.
ABC
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Kids—they grow up so fast! When the world first met Modern Family's Lily in 2009, she was a little baby and remained so for two seasons. Then she became a witty four-year-old thanks to some growth hormones, or a change in casting from twins Jaden and Ella Hiller to Aubrey Anderson-Emmons.

2. Rachel Dawes, The Dark Knight

Rachel version 2.0 was a major upgrade.
WB

Katie Holmes—at the time regaining fame for her relationship with a very well-known actor—portrayed Rachel Dawes alongside Christian Bale in 2005's Batman Begins. Then, whether because of salary negotiations or Holmes's deep desire to star in Mad Money with Diane Keaton and Queen Latifah, Maggie Gyllenhall ended up stepping in as Rachel for The Dark Knight. (Salary negotiations makes more sense.)

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3. Vivian Banks, The Fresh Prince of Bel-Air

Was any attempt made to cast a similar-looking actress?
NBC

For three years, Janet Hubert introduced Will Smith to the streets of Bel-Air as his Aunt Viv. On-screen, they were a loving family. Off-screen, they did not get along. Come season four, Hubert was out and Daphne Reid was the woman wearing Viv's blouses.

4. Darrin Stephens, Bewitched

Apparently people liked their OG Dick.
ABC

After five seasons of watching Dick York play the slightly annoying husband of Samantha in Bewitched, viewers were suddenly seeing another Dick by the name of Dick Sargent. York left the role of Darrin Stephens due to a back problem and a related habit for painkillers. Viewers did not appreciate this other Dick, and the show's ratings dropped significantly. 

5. Daario ‚ÄčNaharis, Game of Thrones

They both do such a good job of being smugly attractive.
HBO
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In season 3 of Game of Thrones, Daario Naharis was a hot blonde guy portrayed by Ed Skrein. In the following season's 2014 premiere, Daario Naharis appeared as a hot brunette guy known in real-life as Michiel Huisman. While it was generally understood that Skrein left the show for the Transporter reboot, he later told Entertainment Weekly that "politics led to [him and the show's creative team] parting ways." Fans were upset at the time, then came to realize Huisman and his naked butt can handle the role just fine.

6. Becky Conner, Roseanne

Becky cannot comprehend the fact that she has two faces.
ABC

First Lecy Goranson played Becky on Roseanne. Then Sarah Chalke did. Then Goranson and Chalke did. This scenario came about after Goranson left the show to go to college in 1992. Chalke signed on, but when Goranson became available again for season eight, they tag-teamed as Becky. Then for the final season, viewers had only one Becky to deal with as Goranson left the show for good.

7. Albus Dumbledore, Harry Potter and the Prisoner of Azkaban

Left: happy. Right: angry.
WB
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In the first two Harry Potter movies, Professor Dumbledore was a kindly, wizened man. Then he got cranky. That's because the original Dumbledore, Richard Harris, passed away following the filming of 2002's The Chamber of Secrets. Michael Gambon took over the role for the next six films and made the old wizard a bit less friendly.

8. Laurie Forman, That '70s Show

These two actually look alike. Good job, casting people.
Fox/Getty Images

After appearing as Laurie Forman for five seasons starting in 1998, Lisa Robin Kelly's face quietly transformed into Christina Moore's. Sadly, Kelly had some serious substance abuse issues and in 2013—10 years after leaving That '70s Show–Kelly died at age 43. 

9. James Rhodes/War Machine, Iron Man 2

Even after a casting change-up, War Machine still doesn't do much.
Getty Images

For the 2010 sequel to the movie that gave Robert Downey Jr. back his popularity and then some, Don Cheadle replaced Terence Howard as James Rhodes. Howard freely admitted he wasn't up for playing Stark's sidekick after the studio downgraded his $8 million salary to $1 million so as to give RDJ more cash. Looks like Cheadle had no probably with taking a smaller piece of a very big pie—he's still playing War Machine in those blockbuster Marvel movies.

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10. Kaitlin Cooper, The O.C.

Kaitlin wasn't as interested in horses when she came home.
Fox
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Little Kaitlin Cooper went from being a bratty child portrayed by Shailene Woodley in season 1 (which debuted in 2003) to Willa Holland's obnoxious 14-year-old in season 3. When it was time for Kaitlin to return from boarding school, Woodley actually auditioned another time to play Marissa's little sister. Woodley didn't make the cut, but she's been doing OK in the young adult market without the role.