SYDNEY LEARNS SHOCKING NEWS ABOUT HER MOTHER'S DEATH FROM KATYA DEREVKO, VAUGHN BECOMES A ROGUE AGENT AND STEALS A DEVICE IN ORDER TO LEARN THE TRUTH ABOUT HIS FATHER, AND MARSHALL QUESTIONS JACK'S HEALTH, ON ABC'S "ALIAS"

Isabella Rossellini Guest Stars as Katya Derevko

Joel Grey (Broadway's "Wicked," "Cabaret") Makes a Guest Appearance

"Pandora" - Sydney learns devastating news from her aunt, Katya Derevko (Isabella Rossellini), about her mother Irina's death. Meanwhile, Vaughn becomes a rogue agent when he steals a device to use as a bargaining tool in order to learn the truth about his father, and Marshall questions Jack's health. Joel Grey (Broadway's "Wicked," "Cabaret") makes a guest appearance, on "Alias," WEDNESDAY, APRIL 13 (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 Isabella Rossellini as Katya Derevko, Joel Grey as another Mr. Sloane, Michael Kenneth Williams as Roberts, Nickolai Stoilov as Jan, Izabella Scorupco as Sabina, Eamon Hunt as Gregor, Michael Giordani as male nurse, Michael Ensign as Vogel, Nick Hoffa as agent, Nicoll Bacharach as doctor and David Richard Thompson as hospital guard.

"Pandora" was written by J.R. Orci & Jeff Pinkner and directed by Kevin Hooks.

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

A TV parental guideline will be assigned closer to airdate.