A downward spiral that Kelli Giddish lobbied for before she even began her Law & Order: SVU run spins completely out of control tonight (NBC, 9/8c), steering Detective Amanda Rollins in a shocking. Amanda Rollins is a fictional character on the NBC police procedural drama Law & Order: Special Victims Unit, portrayed by Kelli Giddish. Rollins is a detective with the Manhattan Special Victims Unit at the 16th Precinct of the New York Police Department. Law and Order SVU 15×17 “Gambler’s Fallacy” – Detective Amanda Rollins’ (Kelli Giddish) addiction drives her to an illegal gambling club, where waitress Clare Wilson (returning guest star Stefanie Scott) recognizes her as a cop.

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Law & Order: SVU showed the dark and dirty side of Rollins on Wednesday, March 12, leaving us speechless, while one of Survivor: Cagayan's tribes continued its campaign for the title of the show's worst tribe in its 28-season history. Plus, The Americans pulled off another doozy of a twist and a surprising proposal went down over on Nashville. Warning, spoilers for many of Wednesday night's shows ahead!

Amanda Rollins Svu Children

Survivor: Cagayan: Holy secondhand embarrassment, Batman! The Brains Tribe is really, really bad, you guys. Like, so bad that when another tribe attempted to throw a competition, they still managed to lose. And in tonight's episode, they lost not one, but two challenges. At least they were able to do one thing right: vote out J'Tia, as this is one tribe that cannot afford any dead weight (who also happened to toss out a lot of their food).

Law & Order: SVU: Have you picked your jaw up off the floor yet? Law & Order:SVU took a step away from the normal case of the week format to give you a story of Rollin's downfall. Or was it a downfall?

Rollins' gambling addiction has reared its ugly head for weeks, but when she's made for a cop in an illegal gambling ring, things take a nasty turn. Donal Logue guest starred as Declan, a behind-the-scenes member of the gambling organization who, along with guest star Sherri Saum, makes Rollins do all sorts of terrible things. She gets rid of evidence, follows a juror and 'gives a blow job.' We put that in quotes because she really didn't give Declan one, he was a cop the whole time and drafted her into his undercover mission. Say whattttttt?! Not even Olivia Benson knew.

Despite messing with evidence that botched a whole mess of things, Rollins got to keep her badge. Hopefully this experience steered the good detective back on the right track.

The Americans: Man, the KGB really is everywhere, right? In tonight's outing, the ever-so-suspicious Paige decided it was time to pay her Aunt Helen a visit. And guess what? SHe's actually real! And guess what again? It turned out she's most likely a KGB plant, who probably isn't even related to Elizabeth, but yet another piece of their cover-up puzzle. She also called up Phillip to let him know about Paige's snooping. Oops!

Nashville: Oh, Will. In order to hide the fact that he's gay from the public, our closeted country crooner decided the best way to do so was by proposing to Layla. Again, we repeat: Oh, Will.

Line of the Night: 'Problem Child 2 wasn't any better than Problem Child 1. I can't believe they made three of those movies.' Hey, we so could've been Tessa 3.0 on Suburgatory tonight if you just changed Problem Child to Home Alone (and they made five HAs, obviously).

THEN AND NOW: All 18 'Law and Order: SVU' series regulars

• 'Law & Order' celebrates 30 years on TV this month — one of the most popular shows in the franchise, 'Law and Order: SVU,' wrapped its 21st season this year.
• Throughout the show's run, there have been 18 actors who have been cast as series regulars.
• Mariska Hargitay has played Detective Olivia Benson since the show aired in 1999. Ice-T is still on the show after joining in the second season.
• Actors like Stephanie March, BD Wong, and Richard Belzer have all returned to the series in guest appearances after leaving the show as a series regular.
• Visit Insider's homepage for more stories.

Over the course of its 20-year history, 'Law and Order: SVU' has become known for its lengthy list of guest appearances — from Serena Williams to Bradley Cooper. But the show's regular cast members have also been making a name for themselves throughout the years.

Some of these actors have stayed on the show for decades, like Mariska Hargitay, Christopher Meloni, and Ice T, while others only appear for a season or two. Some even return in guest appearances after their departure.

Keep reading to find out when each actor joined the series and to see what they're up to now.