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

Jessica Napoli

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 In

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