It's a shame when an actor ruins a perfectly good TV show.
But that's exactly what happened to these 13 shows.
Scroll down to find out which shows and actors we're talking about here.
Bill Cosby - The Cosby Show
This comedy series had a lot of fans because it focused on wholesome family values. However, the entire legacy of the series was tarnished when a lot of women came forward to accuse the comedian of using fame to sexually assault them.
Rosanne Barr - Roseanne
Barr went on a Twitter tirade against former Obama aide, Valerie Jarrett and hurled a racist insult. In response, ABC canceled her show. It later returned as a spinoff -- without Barr.
Lori Loughlin - Fuller House
Fuller House was already announced as ending before Loughlin's part in the college admissions scandal came to light. But word on the street is that Loughlin has not been asked back for the final season. It will be weird ending the show without Aunt Becky.
Chevy Chase - Community
Chevy went to war with Community creator Dan Harmon on the set of this NBC/Yahoo series ... until he was fired for his bad behavior. At one point, Chase left a voicemail o Harmon's phone complaining about his lack of talent.
Stephen Collins - 7th Heaven
Collins appeared on all 11 seasons of this WB/CW drama. But the family drama's legacy was rocked in 2014 when a tape leaked of him admitting to sexual abuse of an underage girl. Despite admitting in an interview that he had inappropriate sexual conduct with three girls, the police never found anything conclusive.
Charlie Sheen - Two and a Half Men
Sheen had a very public falling out with Chuck Lorre, the creator of The Big Bang Theory. This coincided with his 2010 meltdown. Sheen was let go and Ashton Kutcher played a new character. The show was never the same.