Sheila Carter
The role was portrayed by Kimberlin Brown for a total of 16 years. Her first run was on "The Young and the Restless" from May 1990 to May 20, 1992, when the character crossed over to "The Bold and the Beautiful" from May 21, 1992, to October 2, 1998, again from May 24 to November 5, 2002, and again finally from September 26 to October 10, 2003. Despite being a regular cast member on "The Bold and the Beautiful", Brown returned to "The Young and the Restless" for several guest appearances beginning on October 27, 1992. Brown departed on November 5, 1992, and reappeared for one episode on December 23, 1992. She continued making appearance from January 7 to 14, 1993, February 19, 1993, to March 2, 1993, October 11, 1993, October 19 to 27, 1993, January 12, 1994, and February 28, 1995, until March 2, 1995.
List of The Young and the Restless characters (2010)
Sarah Smythe first appeared on April 19, 2010, portrayed by Tracey E. Bregman, who also portrays Lauren Baldwin, of whom Sarah is a doppelgänger. Sarah is the sister of Sheila Carter, Lauren's longtime nemesis. The character's creation was first announced in early April 2010. In an interview with "TV Guide Magazine" actress Tracey E. Bregman stated "I think it’d be too easy to kill Lauren. Sarah really wants Lauren to suffer because Sarah has suffered so much. In Sarah’s mind, Sheila was murdered in cold blood by Lauren. Also, Sarah had to raise Sheila’s children because Sheila was always so obsessed with Lauren that she wasn’t around to raise her kids properly." Bregman also noted that Sarah was "setting up this revenge" and was as powerful as Sheila.