Before they were famous faces, these actors popped up on The Office.

1. Amy Adams // "Katy"

A few months before her Academy Award-nominated breakout performance in Junebug, Amy Adams appeared as Katy, a young purse saleswoman, in the season one finale episode "The Hot Girl." She also popped up in two season two episodes—"The Fire" and "Booze Cruise"—playing Jim Halpert's girlfriend.

In an interview with Advocate.com, Amy Adams expressed her admiration for The Office, saying that it "was the best work experience. I loved that show and that cast so much. I don't know if they believe me, but every time I see them I'm like, 'Oh my gosh, I'll do anything to come back.'" BJ Novak wanted to include Amy Adams in a cameo appearance in "Threat Level Midnight" in season seven, but she was unable to appear because of a scheduling conflict.

2. Ken Jeong // "Bill"

Early in his career, Ken Jeong appeared briefly as Bill, a member of Michael Scott's improv group in "E-Mail Surveillance," the ninth episode of season two. Jeong would later star in Knocked Up, Transformers: Dark of the Moon, and The Hangover film trilogy.

3. Kevin McHale // "Delivery Kid"

In "Launch Party," the third episode of season four, Glee's Kevin McHale played the young pizza delivery kid from Pizza by Alfredo. Michael Scott kidnapped the delivery boy when he refused honor a coupon.

4. Melissa Rauch // "Cathy"

Melissa Rauch played Cathy, the young mother who shares a hospital room with Pam Beesly after she gives birth to her first child, in the sixth season episode "The Delivery." Rauch would later land a series regular spot as Dr. Bernadette Rostenkowski on The Big Bang Theory.

5. Yvette Nicole Brown // "Paris"

In the season three episode "The Return," Yvette Nicole Brown played Paris, Dwight Schrute's co-worker at Staples. Brown is best known as Shirley Bennett on Community on NBC (and now Yahoo! Screen).

6. Scott Adsit // "The Photographer"

Scott Adsit is best known as the fictional TGS producer Pete Hornberger on NBC's 30 Rock. But before he landed the role, he played a photographer in the season two episode "Conflict Resolution."

7. John Gemberling // "Caterer Greeting Guests"

In a very brief appearance during the show's two-part series finale, John Gemberling played a caterer greeting guests at Angela and Dwight's wedding on the farm. Gemberling is best known for his main cast role as Gil on NBC's Marry Me and his recurring role as Abbi's roommate's freeloading boyfriend Bevers on Broad City on Comedy Central. 

8. Evan Peters // "Luke"

Before he starred on American Horror Story and X-Men: Days of Future Past, Evan Peters appeared as the new office assistant Luke in the season seven premiere episode "Nepotism." The Dunder Mifflin workers didn't like Luke because he was an incompetent slacker, but Michael Scott was reluctant to fire him because he was his nephew.

9. Tim Kang // "Koh"

In the fourth season episode "Local Ad," Tim Kang played Koh, one of the ad executives in charge of making a commercial for the Dunder Mifflin Paper Company. Kang is best known for playing Agent Kimball Cho on The Mentalist on CBS.

10. Randall Park // "Steve"

Before playing Kim Jong-Un in The Interview, Randall Park played Steve, a.k.a. "Asian Jim Halpert," in the season nine premiere. Jim tries to convince Dwight that he was Asian the whole time they knew each other during the episode's cold open. Park is also the co-lead in the new sitcom Fresh off the Boat on ABC.