Lucy's character name is Mrs X and the following is from the ABC Medianet:
NO 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: