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.
Sheila Carter
In 2010, Sarah Smythe, Sheila Carter's sister, arrives in town. Having herself had plastic surgery to resemble Lauren, Sarah holds both Phyllis and Lauren responsible for her sister's death. Sarah devises a plan with Daisy Carter and Ryder Callahan, Sheila's twins with Tom Fisher, to take over Lauren's life and riches. The plan fails, with Lauren shooting and killing Sarah in self-defense to Sarah's attempt to fire her gun at Phyllis. In 2012, a woman claiming to be Daisy's mother checks her out of a mental institution, signing the name "Sheila Carter" on the release form. Michael has said signature analyzed to see if it fits Sheila's handwriting, and results turn out to be inconclusive.