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.
Tina Carter
Tina was introduced as the sister of established regular character Shirley Carter (Linda Henry), who has appeared on the show since 2006. Tina's daughter Zsa Zsa Carter previously appeared in 2010, played by Emer Kenny, and mentioned her mother as living in Spain with her new husband. Two days before the character's arrival was announced, Treadwell-Collins posted a photo to Twitter of a bomber jacket with the name Tina on the back, sparking speculation that Shirley's sister had been cast. The casting of Luisa Bradshaw-White was announced on 19 September 2013, around two months before her first on-screen appearance.