Here are TV episodes that actors refused to participate in.
TV Episodes That Actors Refused To Film
Everyone has lines they won't cross, even if they aren't sure quite where those lines are until they're right up against them. Actors are no different. Every time they get a television script they're uncomfortable with, they have to make a choice: Do what's on the page and collect a paycheck, or stay true to themselves and hope for the best. Sometimes their refusal to do the episode gets the show to change it. Other times, that refusal gets the show to change actors.