As the only currently active outpost in the know Buffy-verse, "Angel" is swelling its cast to include even more familiar faces, as well as one or two new characters to replace departed Charisma Carpenter and Vincent Kartheiser.

As has long been rumored, Mercedes McNab will join the show on a recurring basis, revisiting her Harmony character. This will allow Harmony, a somewhat bumbling vampire whose attempts at self-empowerment rarely end well, to reunite with former flame Spike (James Marsters, who has already been announced as a new series regular). McNab made appearances as Harmony on both "Buffy the Vampire Slayer" and "Angel."

McNab's other credits include appearances on "Dawson's Creek" and "Boston Public."

The WB has also confirmed that another "Boston Public" alum, Sarah Thompson, will join "Angel" for at least six episodes as Eve, a new assistant to David Boreanaz's Angel at Wolfram & Hart. Those in the know are coy about Thompson's character, who may or may not provide temptation for the show's undead hero.

Thompson, who played high school seductress Dana Pool in the first season of "Boston Public," appeared on episodes of "The District" and "Touched by an Angel" last season. She also was in the feature "Malibu's Most Wanted."