MARK INTERROGATES HELLINGER TO FIND OUT WHEN THE NEXT BLACKOUT WILL OCCUR, AND DEMETRI MUST CHOOSE BETWEEN TURNING SIMON OVER TO THE FBI OR HELPING HIM AND JANIS BREAK INTO NLAP IN ORDER TO STOP THE IMPENDING BLACKOUT, ON ABC'S "FLASHFORWARD"

Gabrielle Union Guest Stars as Zoey

"Countdown" - Mark continues his interrogation of Hellinger in a desperate attempt to find out when the next blackout will occur; Demetri must choose between helping Janis and Simon break into NLAP to stop the blackout from occurring, or turning the fugitive Simon in to the FBI; Lloyd finds the common denominator that can help him solve the complex equation he was working on in his flashforward; while Tracy fights for her life, Aaron discovers why Jericho was after her; and Nicole wrestles over her strong feelings for Bryce and what would happen if she told him she knew the whereabouts of Keiko, on "FlashForward," THURSDAY, MAY 20 (8:00-9:00 p.m., ET) on the ABC Television Network.

"FlashForward" stars Joseph Fiennes as Mark Benford, John Cho as Demetri Noh, Jack Davenport as Lloyd Simcoe, Zachary Knighton as Bryce Varley, Peyton List as Nicole Kirby, Dominic Monaghan as Simon, Br�an F. O'Byrne as Aaron Stark, Courtney B. Vance as Stanford Wedeck, Sonya Walger as Olivia Benford and Christine Woods as Janis Hawk.

Guest starring are Gabrielle Union as Zoey, Genevieve Cortese as Tracy, Lennon Wynn as Charlie, Ryan Wynott as Dylan, Michael Ealy as Marshall Vogel, Yuko Takeuchi as Keiko, Neil Jackson as Lucas Hellinger, Hira Ambrosino as Yuuka Arahida, Carlease Burke as Francine, Yoko Misawa as Teek, Scott Allen Rinker as clean cut man, Jake Johnson as Powell, Dominic Rains as Kahmir and Dominic Bogart as Keith Connor.

"Countdown" was written by Lisa Zwerling & Seth Hoffman and directed by John Polson.

"FlashForward" 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.

For more information on "FlashForward," visit ABC.com