Bewitched
Hold onto your broomsticks, did you know that Darrin from Bewitched was a recast? Dick York was beloved on the show, so when he left to deal with his severe back issues, fans were less than thrilled. Dick Sargent took on the job of husband, and the ratings didn't fall in love with him the way producers hoped.
Crazy Ex-Girlfriend
Did you spy Greg's recasting in the show Crazy Ex-Girlfriend? Greg's character left the show, but when he returned, he came back as Broadway celeb Skylar Astin. This change was written into his character, with the protagonist realizing how much someone's perception can change over time. Santino Fontana was happy to hand over the role so he could return to the theatre.