EXCLUSIVE: Jennifer Garner says her new movie explores people's 'desire to drop out of their own lives'


There's a simple reason why Jennifer Garner agreed to the role of Diana in the upcoming movie Wakefield. It spoke to her.

ET caught up with the 45-year-old actress on Thursday at the film's premiere in New York City, and she explained why she thinks Wakefield will resonate with audiences. In the movie, Bryan Cranston plays a man, Howard Wakefield, who has a nervous breakdown, and leaves his wife (Garner) to go live in his attic for several months.

"I think anyone can imagine just the desire to drop out of their own lives," Garner noted. "It's just to actually do it, to follow through and to live outside of your life [while] watching your own life for a year, [that] is pretty out there."

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Jennifer Garner at 'Wakefield' screening
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Jennifer Garner at 'Wakefield' screening
NEW YORK, NY - MAY 18: Jennifer Garner attends The Cinema Society and FIJI Water host a screening of IFC Films' 'Wakefield' on May 18, 2017 in New York City. (Photo by Sylvain Gaboury/Patrick McMullan via Getty Images)
NEW YORK, NY - MAY 18: Bryan Cranston and Jennifer Garner attend The Cinema Society And FIJI Water Host A Screening Of IFC Films' 'Wakefield' at Landmark Sunshine Cinema on May 18, 2017 in New York City. (Photo by Jamie McCarthy/Getty Images)
NEW YORK, NY - MAY 18: Jennifer Garner departs Stephen Colbert show on May 18, 2017 in New York City. (Photo by Gotham/GC Images)
NEW YORK, NY - MAY 18: Bryan Cranston and Jennifer Garner attend The Cinema Society And FIJI Water Host A Screening Of IFC Films' 'Wakefield' at Landmark Sunshine Cinema on May 18, 2017 in New York City. (Photo by Jamie McCarthy/Getty Images)
NEW YORK, NY - MAY 18: Writer?director Robin Swicord,Bryan Cranston and Jennifer Garner attend The Cinema Society And FIJI Water Host A Screening Of IFC Films' 'Wakefield' at Landmark Sunshine Cinema on May 18, 2017 in New York City. (Photo by Jamie McCarthy/Getty Images)
NEW YORK, NY - MAY 18: Bryan Cranston and Jennifer Garner attend The Cinema Society And FIJI Water Host A Screening Of IFC Films' 'Wakefield' at Landmark Sunshine Cinema on May 18, 2017 in New York City. (Photo by Jamie McCarthy/Getty Images)
NEW YORK, NY - MAY 18: Bryan Cranston and Jennifer Garner attend The Cinema Society And FIJI Water Host A Screening Of IFC Films' 'Wakefield' at Landmark Sunshine Cinema on May 18, 2017 in New York City. (Photo by Jamie McCarthy/Getty Images)
NEW YORK, NY - MAY 18: Jennifer Garner departs Stephen Colbert show on May 18, 2017 in New York City. (Photo by Gotham/GC Images)
NEW YORK, NY - MAY 18: Jennifer Garner attends The Cinema Society and FIJI Water host a screening of IFC Films' 'Wakefield' on May 18, 2017 in New York City. (Photo by Sylvain Gaboury/Patrick McMullan via Getty Images)
NEW YORK, NY - MAY 18: Jennifer Garner attends The Cinema Society And FIJI Water Host A Screening Of IFC Films' 'Wakefield' After Party at Hotel on Rivington on May 18, 2017 in New York City. (Photo by Jamie McCarthy/Getty Images)
NEW YORK, NY - MAY 18: Bonnie Curtis, Robin Swicord, Bryan Cranston, Jennifer Garner, Carl Moellenberg, Wendy Federman and Lisa Schwartz attend a special screening of 'Wakefield' hosted by FIJI Water and the Cinema Society at Landmark Sunshine Cinema on May 18, 2017 in New York City. (Photo by Craig Barritt/Getty Images for FIJI Water)
NEW YORK, NY - MAY 18: Jennifer Garner attends a special screening of 'Wakefield' hosted by FIJI Water and the Cinema Society at Landmark Sunshine Cinema on May 18, 2017 in New York City. (Photo by Craig Barritt/Getty Images for FIJI Water)
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PHOTOS: Jennifer Garner Stuns in Sexy Lace Dress While Out in NYC

Garner -- who looked stunning at the premiere in a strapless black and gold dress -- also praised Cranston for his performance in the film, calling him "the most fun."

"He's such a goofball and he went through so much making this movie," she recalled. "He was constantly putting a beard on, putting dirty nails on, he got skinnier and skinnier all the time. I don't know why I work with these guys who are all getting skinny! But whatever, he did, he really went through it."

WATCH: Ben Affleck Says He Would Love to Direct Jennifer Garner in a Female-Driven Film

See photos of Jennifer Garner and Ben Affleck together:

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Jennifer Garner and Ben Affleck
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Jennifer Garner and Ben Affleck
LOS ANGELES, CA - NOVEMBER 13: Jennifer Garner and Ben Affleck are seen on November 13, 2016 in Los Angeles, California. (Photo by BG004/Bauer-Griffin/GC Images)
LOS ANGELES, CA - MARCH 06: Jennifer Garner and Ben Affleck are seen on March 06, 2016 in Los Angeles, California. (Photo by Stone-e/Bauer-Griffin/GC Images)
LOS ANGELES, CA - OCTOBER 05: Jennifer Garner and Ben Affleck are seen on October 05, 2014 in Los Angeles, California. (Photo by GONZALO/Bauer-Griffin/GC Images)
LOS ANGELES, CA - OCTOBER 03: Ben Affleck and Jennifer Garner are seen on October 03, 2014 in Los Angeles, California. (Photo by GONZALO/Bauer-Griffin/GC Images)
WEST HOLLYWOOD, CA - MARCH 02: Actor/director Ben Affleck (L) and wife actress Jennifer Garner attend the 2014 Vanity Fair Oscar Party hosted by Graydon Carter on March 2, 2014 in West Hollywood, California. (Photo by David Livingston/Getty Images)
LOS ANGELES, CA - FEBRUARY 18: Ben Affleck and Jennifer Garner are seen holding hands on February 18, 2014 in Los Angeles, California. (Photo by Bauer-Griffin/GC Images)
LOS ANGELES, CA - FEBRUARY 06: Ben Affleck and Jennifer Garner are seen with their daughter, Seraphina Affleck on February 06, 2014 in Los Angeles, California. (Photo by GONZALO/Bauer-Griffin/GC Images)
LOS ANGELES, CA - JANUARY 18: Actors Jennifer Garner and Ben Affleck attend the 20th Annual Screen Actors Guild Awards at The Shrine Auditorium on January 18, 2014 in Los Angeles, California. (Photo by Christopher Polk/WireImage)
LOS ANGELES, CA - NOVEMBER 29: Ben Affleck and Jennifer Garner are seen on November 29, 2013 in Los Angeles, California. (Photo by Bauer-Griffin/GC Images)
LOS ANGELES, CA - November 07: Ben Affleck and Jennifer Garner are seen on November 07, 2013 in Los Angeles, California. (Photo by Bauer-Griffin/FilmMagic)
LOS ANGELES, CA - JULY 16: Ben Affleck and Jennifer Garner are seen on July 16, 2013 in Los Angeles, California. (Photo by Bauer-Griffin/GC Images)
SATURDAY NIGHT LIVE -- 'Ben Affleck' Episode 1641 -- Pictured: (l-r) Jennifer Garner and Ben Affleck during the monologue on May 18, 2013 -- (Photo by: Dana Edelson/NBC/NBCU Photo Bank via Getty Images)
LOS ANGELES, CA - MARCH 10: Actors Jennifer Garner (L) and Ben Affleck attend the John Varvatos 10th Annual Stuart House Benefit presented by Chrysler, Kids Tent by Hasbro Studios, at John Varvatos Los Angeles on March 10, 2013 in Los Angeles, California. (Photo by Donato Sardella/Getty Images for John Varvatos)
Argo director Ben Affleck kisses his wife actress Jennifer Garner after winning the Oscar for Best Movie at the 85th Annual Academy Awards on February 24, 2013 in Hollywood, California. AFP PHOTO/Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)
LONDON, ENGLAND - FEBRUARY 09: Ben Affleck (L) and Jennifer Garner attend the Charles Finch and Chanel Pre-BAFTA cocktail party and dinner at Annabel's on February 9, 2013 in London, England. (Photo by Dave M. Benett/Getty Images)
LOS ANGELES, CA - JANUARY 27: Ben Affleck and Jennifer Garner attend the 19th Annual Screen Actors Guild Awards at The Shrine Auditorium on January 27, 2013 in Los Angeles, California. (Photo by Kevin Mazur/WireImage) 23116_016_1209.jpg
LOS ANGELES, CA - NOVEMBER 30: Ben Affleck and Jennifer Garner are seen on November 30, 2012 in Los Angeles, California. (Photo by Bauer-Griffin/GC Images)
BEVERLY HILLS, CA - OCTOBER 05: Actors Ben Affleck and Jennifer Garner attend Variety's 4th Annual Power of Women Event Presented by Lifetime at the Beverly Wilshire Four Seasons Hotel on October 5, 2012 in Beverly Hills, California. (Photo by Amanda Edwards/WireImage)
BEVERLY HILLS, CA - OCTOBER 04: Actors Ben Affleck and Jennifer Garner arrive at the premiere of Warner Bros. Pictures' 'Argo' at AMPAS Samuel Goldwyn Theater on October 4, 2012 in Beverly Hills, California. (Photo by Jason Merritt/Getty Images)
TORONTO, ON - SEPTEMBER 07: Jennifer Garner and Ben Affleck attends 'Argo' Post Premiere Party - 2012 Toronto International Film Festival on September 7, 2012 in Toronto, Canada. (Photo by Sonia Recchia/Getty Images)
LOS ANGELES, CA - NOVEMBER 04: Ben Affleck and Jennifer Garner are seen on November 04, 2016 in Los Angeles, California. (Photo by BG004/Bauer-Griffin/GC Images)
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Wakefield hits theaters on May 19.

Garner has been going through some changes in her own life, as she and husband Ben Affleck filed for divorce last month. Here is ET's look back at their relationship and two-year separation:

Reporting by Darla Murray.

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