Jennifer Garner
The actress played a graduate student who has a romantic encounter with Benjamin Bratt's character in a 1996 episode.
Adam Driver
Before his breakout role on Girls, Driver appeared on Law & Order's final 2010 season and played a lab technician accused of murdering an escort.
Sebastian Stan
Nearly 20 years ago, the Pam & Tommy star played a boy abducted and raised by his abuser in 2003.
Allison Janney
Early in her career, the Oscar winner popped up on Law & Order twice in 1992 and 1994. The first time, she played a character scared to testify about a murder. She returned two years later to portray someone interviewed about the murder of soap opera actress.
Emmy Rossum
Rossum's very first acting gig was on a 1997 episode playing a preteen who was the target of a female circumcision.
Sarah Paulson
In her very first TV role, the Emmy winner played a teen who claimed that she was having an affair with her murdered mother's new husband in 1994.
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In his first television role, the future Oscar winner played a drug dealer betrayed by another crook. Samuel L. Jackson is his lawyer.
Claire Danes
Even before her starring role on My So-Called Life, the actress played a troubled teen in a 1992 episode that also featured future Six Feet Under star Lauren Ambrose.
Ellen Pompeo
The Grey's Anatomy actress actually appeared on Law & Order twice, in 1996 and 2000. (Fellow Grey's stars Kate Walsh and Chandra Wilson also got work on the series.)