Eden Riegel – who is now on “Young and the Restless” but spent many years as Bianca, Erica Kane’s (Susan Lucci’s) daughter and daytime TV’s first contracted lesbian character, on “All My Children” (earning her a Daytime Emmy Award in 2005) – will guest star on ABC’s “Castle.” In the episode entitled “Punked,” Riegel plays Rachel Goldstein, the distraught sister of a man killed by an antique pistol. “Castle” will premiere Monday, September 20 (10:00-11:00 p.m., ET).