WHEN SYDNEY IS INFECTED WITH A DEADLY HALLUCINOGEN, IT'S UP TO VAUGHN AND JACK TO FIND THE ANTIDOTE BEFORE HER RESULTANT VIOLENT BEHAVIOR CONSUMES HER, ON ABC'S "ALIAS"

"Nocturne" - Sydney becomes infected with a mind-altering and potentially deadly hallucinogen, causing her to slowly lose touch with reality. Vaughn and Jack must scramble to find an antidote before Sydney's hallucinations, paranoia and resultant violent behavior threaten her life and the lives of those around her, on "Alias," SUNDAY, FEBRUARY 9 (9:01-10:02 p.m., ET), on the ABC Television Network.

"Alias" stars Jennifer Garner as Sydney Bristow, Victor Garber as Jack Bristow, Ron Rifkin as Arvin Sloane, Michael Vartan as Michael Vaughn, Carl Lumbly as Marcus Dixon, Kevin Weisman as Marshall Flinkman, Greg Grunberg as Eric Weiss and Mia Maestro as Nadia Santos.

Guest starring are Nick Jaine as Dr. Maneesha Jain, Julie Ann Emery as Nancy Cahill, Julia Levy-Boeken as Martina, Liza De Weerd as Anna-Dutch student, Michael Nagy as Letuza (aka pale blond man), Will Schaub as Jason Cahill, Michael Goorjian as Andre Sterescu, Sunah Bilsted as kissing blond, Ryan Gentry as not Vaughn and Craig Ricci Shaynak as Czech guard.

"Nocturne" was written by Jeff Pinkner and directed by Lawrence Trilling.

"Alias" is broadcast in 720 Progressive (720P), ABC's selected HDTV format, with 5.1-channel surround sound.

This program carries a TV-14,V parental guideline.