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Dianna Agron has appeared in thirteen feature films, thirteen television series/films, four short films, three music videos, one play, two commercials, and has directed two short films and two music videos.
Agron's acting career debuted in 2006 with her character of Kelly in the film After Midnight: Life Behind Bars, but her first important role was in CSI:NY as Jessica Grant, who appears in only one episode. After that, in 2006, Agron was featured in many TV series as a minor or recurring character, such as Drake & Josh (2006) and Shark (2006). Agron played Jenny Budosh on Veronica Mars, and appeared in three episodes of the third season, which aired between 2006 and 2007. Agron was then cast as Debbie Marshall, a mean cheerleader on Heroes. Debbie was featured in five episodes of the second season. In 2007, Agron landed her first main character in It's a Mall World; and later, in 2009, she was cast as Quinn Fabray on the hit musical TV show Glee. Quinn was first introduced as an antagonist, and was the captain of the cheerleading squad and Finn Hudson's (Cory Monteith) girlfriend. After being part of the regular cast for the first three seasons, Agron was demoted to a guest star status.
Agron appeared in T.K.O. (2007), Skid Marks (2007), The Romantics (2010), and Burlesque (2010). In 2011, Agron portrayed Alice in The Hunters, and she was later cast as Sarah Hart in I Am Number Four, the movie also starring Alex Pettyfer, Timothy Olyphant, and Teresa Palmer. Later that year, Agron was featured in Glee: The 3D Concert Movie. Dianna co-starred as Belle Blake in the 2013 film The Family, alongside Robert De Niro, Michelle Pfeiffer, and Tommy Lee Jones. In 2015, Agron portrayed Dalia in the political thriller Zipper, Finley in the romantic comedy Tumbledown, Sarah Barton in the drama Bare, and narrated part of the film Unity. Agron has four films in post-production: A Conspiracy on Jekyll Island (2016), and Headlock (2016), Hollow in the Land (2016), and Novitiate (2016). In 2015, she starred in the play McQueen.