Amanda Peet completes the top-flight cast in the latest X-Files film, “X-Files: I Want To Believe” with David Duchovny and Gillian Anderson.

Peet is cast as Dakota Whitney, an FBI agent tasked to crack a series of mysterious cases who enlists Mulder’s (Duchovny) help. Like everything else connected to the film, details about Whitney have been shrouded in secrecy. Peet says joining The X-Files team had, not surprisingly, its unusual moments. “It felt a bit odd to be a guest in this phenomenon. But it was enjoyable, too, becoming a part of this world that is so well-established. And to watch David and Gillian portray this iconic couple, Mulder and Scully was extraordinary.”

The shoot’s physical rigors were perhaps her greatest challenge. “I should have suspected…something…when, before production began, director Chris Carter asked me if I was fit – could I run in the snow? Now, I had given birth eight months earlier, and I hadn’t exactly been running any marathons. But of course I told Chris, ‘Yeah, I’m in shape! And the first four days of filming had me running, running and running – and hoping I would look cool.”

Amanda Peet is an accomplished and versatile film actress who is best known for her diverse choice of roles in romantic comedies, dramas and thrillers. She was recently seen with John Cusack in ‘The Martian Child,” and starred as Jordan McDeere on Aaron Sorkin’s television series “Studio 60 on the Sunset Strip.” In addition, her voice will be featured in the animated film “Terra” along with the voices of Luke Wilson, Evan Rachel Wood, and Dennis Quaid.

In 2006, Peet made her Broadway debut in the revival of Neil Simon’s comedy “Barefoot In the Park.” She also starred to critical acclaim, in the Neil LaBute off-Broadway play “This Is How It Goes” opposite Ben Stiller and Jeffrey Wright.

Her numerous film credits include the Oscar® nominated “Syriana,” “A Lot Like Love,” “Melinda and Melinda,” “The Whole Nine Yards” and its sequel “The Whole Ten Yards,” the 2003 hit “Something’s Gotta Give” and the thriller “Identity.” Her other past credits include “High Crimes,” “Changing Lanes,” “Igby Goes Down” and “Jack and Jill.”

A native of New York, Peet graduated from Columbia University with a degree in American History. While there, she also studied acting under Uta Hagen, which ultimately led her to pursue acting as a career.