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Rex Features
The actor, famous for his roles in Lost and Lord Of The Rings, will play a character called Simon.
Speaking at this year's Comic-Con, the show's producer David S. Groyer initially refused to confirm or deny rumours surrounding Monaghan's involvement in the project.
Moments later, fans were treated to a sneak preview of the series, including an shot of Monaghan, whose character Goyer described as "game-changing".
FlashForward is due to premiere Thursday, September 24 on ABC.
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The Best TV Couples: Friday FiverTube Talk celebrates Valentine's Day by reminiscing about the best TV couples.
2012-13 Season
John Stamos to star in 'Little Brother'The former Full House actor will star in the comedy pilot Little Brother.
US TV Interviews
'Celebrity Apprentice' Donald Trump Q&ADonald Trump teases the new season of Celebrity Apprentice.
US TV Ratings
'Vampire Diaries' soars to 3m for The CWThe Vampire Diaries and The Secret Circle perform well for The CW.
