*SPOILER ALERT!* ABC Television Network PRESS RELEASE - ENTERTAINMENT - ALIAS (4/27) THE AGENCY ACTS TO STOP AN APOCALYPTIC EVENT - PROPHESIZED BY RAMBALDI - AND VAUGHN QUESTIONS DIXON'S STATE OF MIND, ON ABC'S "ALIAS" David Carradine ("Kung Fu," upcoming "Kill Bill"), Amanda Foreman ("Felicity") and Patricia Wettig ("thirtysomething") Guest Star "Countdown" -- A Rambaldi artifact prophesizes that an apocalyptic event will soon take place, and Dixon's grief leads Vaughn and agency psychologist Dr. Barnett (Patricia Wettig, "thirtysomething") to question his intentions, as his thirst for revenge on Sloane intensifies. Meanwhile Sloane receives a life-changing revelation from a mysterious monk in Nepal (David Carradine, "Kung Fu," upcoming "Kill Bill"), Sydney and Dixon hunt for the killer who stole the heart from his victim, and Marshall falls for a new co-worker (Amanda Foreman, "Felicity"), on "Alias," SUNDAY, APRIL 27 (9:00-10:00 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, Lena Olin as Irina Derevko, Bradley Cooper as Will Tippin, Merrin Dungey as Francie Calfo, Carl Lumbly as Marcus Dixon, Kevin Weisman as Marshall Flinkman and David Anders as Mr. Sark. Guest starring are Amanda Foreman as Carrie Bowman, Jonathan Banks as Brandon, Jimmie F. Skaggs as captain, Patricia Wettig as Barnett, Danny Trejo as Vargas, Carlos Cervantes as Panamanian detective, David Carradine as Conrad, Allen Evangelista as Jandu, Ryan Honey as delta force leader and James Carraway as Proteo Di Regno. The story for "Countdown" was by R.P. Gaborno and the teleplay by Jeff Pinkner. The episode was directed by Lawrence Trilling. "Alias" is broadcast in 720 Progressive (720P), ABC's selected HDTV format, with 5.1-channel surround sound. A TV parental guideline will be posted closer to airdate.