Lucy's character name is Mrs X and the following is from the ABC Medianet:

mrsx.jpgNO ORDINARY FAMILY - "No Ordinary Love" - The mysterious Mrs. X (Lucy Lawless, "Xena: Warrior Princess," "Battlestar Galactica") tasks the sexy - and dangerous - Sophie ("Battlestar Galactica's Tricia Helfer) to cause Jim and George to fall under her spell and make them do whatever she wants them to - which could place Jim's marriage in jeopardy. Meanwhile, Stephanie must decide whether or not to inject a patient with the trilsettum serum and risk turning him into a super in order to retain Dr. King's trust, and Daphne's boyfriend, Chris, begins to have suspicions about the Powell family's abilities, on "No Ordinary Family," TUESDAY, MARCH 1 (8:00-9:00 p.m., ET) on the ABC Television Network. (ABC/KAREN NEAL) LUCY LAWLESS, TRICIA HELFER

So far two episode names have been posted on IMDb:

- No Ordinary Animal (2011) ... Mrs. X
- No Ordinary Love (2011) ... Mrs. X

-- AUSXIP Reporter: Klippart