Dallas – Barbara Bel Geddes was replaced by Donna Reed, who was then replaced by Barbara Bell Geddies again

Miss Ellie Ewing

When the show premiered, they had Barbara play the role of the socialite. After 6 years, she wanted to move on from the role, so she was recast. The new actress could only handle doing one season of the show, so she asked to leave and they brought the original Donna back.