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).

Actor Victor Webster ("Melrose Place") will guest star on ABC's "Castle," playing new boyfriend to Kate Beckett (Stana Katic). In the episode entitled "Punked" (airdate TBD), Josh Davidson (Webster) surprises Beckett by coming to the precinct to pick her up. On seeing the big and sexy Davidson, the gang wonder: Who the hell is that guy? "Castle" will premiere Monday, September 20 (10:00-11:00 p.m., ET) on ABC.

Actor Ken Baumann ("The Secret Life of the American Teenager") will join ABC's "Castle" in a recurring role, playing the first boyfriend for Alexis Castle (Molly Quinn). In his first episode, "Punked," Richard Castle (Nathan Fillion) is dealing with the fact Alexis is excited about having her first boyfriend, but he's unnerved that she's not confiding in him with all the details. "Castle" will premiere Monday, September 20 (10:00-11:00 p.m., ET).