'Law & Order: SVU' Heads Into Season 20 — See How Much the Cast Has Changed (PHOTOS)

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Law & Order: Special Victims Unit - Season 3
Craig Blankenhorn/NBC/NBCU Photo Bank via Getty Images
Law & Order: Special Victims Unit - Season 3
Craig Blankenhorn/NBC/NBCU Photo Bank via Getty Images

Mariska Hargitay as Olivia Benson (2001)

Law & Order: Special Victims Unit - Season 19
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Mariska Hargitay (2018)

Law & Order: Special Victims Unit
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Christopher Meloni as Elliot Stabler (2001)

Photo Call For WGN America's
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Christopher Meloni (2018)

Law & Order: Special Victims Unit
Eric Liebowitz/NBCU Photo Bank

Ice-T as Odafin ‘Fin’ Tutuola (2001)

Law & Order: Special Victims Unit - Season 19
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Ice-T (2018)

Law & Order: Special Victims Unit
Craig Blankenhorn/NBCU Photo Bank

Dann Florek as Donald Cragen (2001)

The Champions Documentary Presented By Best Friends Animal Society
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Dann Florek (2018)

Law & Order: Special Victims Unit
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Richard Belzer as John Munch (2001)

The Paley Center For Media Presents:
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Richard Belzer (2018)

Law & Order: Special Victims Unit
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B.D. Wong as Dr. George Huang (2003)

Premiere Of Universal Pictures And Amblin Entertainment's
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B.D. Wong (2018)

Law & Order: Special Victims Unit
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Tamara Tunie as Dr. Melinda Warner (2005)

Closing Ceremony - 58th Monte Carlo TV Festival
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Tamara Tunie (2018)

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Law & Order: SVU is heading into an unprecedented 20th season.

The procedural drama will be tying with the original Law & Order and Gunsmoke for longest-running primetime scripted drama series.

Will Stabler & Barba Return to 'Law & Order: SVU'? Mariska Hargitay Weighs InSee Also

Will Stabler & Barba Return to 'Law & Order: SVU'? Mariska Hargitay Weighs In

The actress on what's in store for the milestone 20th season and for Olivia Benson.

Many of the original cast members have come and gone except for boss lady Mariska Hargitay, who has stayed steady with the series since its premiere in September 1999.

In celebration of Season 20, let's take a look at how much the cast has changed — just click through the gallery above.

Law & Order: SVU, two-hour Season 20 premiere, Thursday, September 27, 9/8c, NBC