Sonya Walger played the role of Penelope Hume.
- Born on June 6, 1974 in London.
- Has an English mother and Argentinian father, which leads to her being mislabeled as being Argentinian, but was born, raised and educated in England.
- Can speak fluent Spanish and translates Argentinian-Spanish plays into English.
- Studied English literature at Oxford University.
- In July 2009 she married Davey Holmes.
- Walger is the second cast member of the Showtime original series Sleeper Cell to appear on Lost. She played Special Agent Patrice Serxner. Marc Casabani (as Tariq) was the first actor to cameo.
- Appeared in the British crime drama Midsomer Murders, where she played a press reporter named Becky Smith.
- Had a guest appearance where she played a similar character to Penelope in the show Numb3rs.
- Appeared in the US remake of BBC TV show Coupling.
- Had a recurring role in BBC sitcom Goodnight Sweetheart.
- Starred on the HBO drama Tell Me You Love Me.
- Appeared on Broadway in 2007 in "Frost/Nixon".
- Guest-starred in three episodes of "Terminator: The Sarah Connor Chronicles".
- Was in the film, Caffeine, a cast crossover which also starred Marsha Thomason (Naomi Dorrit of Lost).
- In 2009-2010, was a series regular on FlashForward along with Lost co-star Dominic Monaghan.
- In 2013, she became an American citizen.
- Was originally offered the role of "Kate" for the pilot, but refused to move to Hawaii. Since then, she maintained contact with the producers who offered her several roles, finally agreeing to play Penelope at the end of Season 2. 
- She is one of six actors to gain main character status in the finale of the series, the others being L. Scott Caldwell, Fionnula Flanagan, Sam Anderson, John Terry and François Chau.
- In both Lost and FlashForward, the character she portrays has a child named "Charlie", although they are of different genders.
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