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.
Joanna Johnson
Johnson reprised her role on "The Bold and the Beautiful" from April 28, 2009 to mid November 2009 as Karen Spencer, a role she played from 1991 to 1994, as well as Karen's twin Caroline Spencer from March 23, 1987 to early-July 1990 and again from late-December 2000 to January 5, 2001. Johnson returned to the role as Karen Spencer on July 22, 2011 and since March 28, 2012 she is on recurring status.