Eddie Kaye Thomas Guest Stars on 'Law & Order: SVU' (PHOTOS)

Law & Order SVU Season 21 Eddie Kaye Thomas Guest Stars Episode 19
Heidi Gutman/NBC

The Law & Order: SVU squad has a tough case on its hands for what has ended up being the penultimate episode of Season 21. (But hey, at least we know that it will be back for three more seasons!)

In "Solving for the Unknowns," Olivia (Mariska Hargitay) and the squad struggle to find a serial predator who uses a date rape drug that doesn't leave any evidence behind. Therefore, there's nothing they can test for, which makes it quite difficult for everyone involved.

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Showrunner Warren Leight has shared details about changes to the NBC drama's season.

In fact, in the promo (below), Carisi (Peter Scanavino) warns, "figure out what is going on, or I'm going to have to drop this case."

Guest stars for the episode include Natalie Smith, Daniel London, Madison Ferris, and Eddie Kaye Thomas (who appeared in two Law & Order episodes). Thomas is in both the preview and the photos. "I did not give them any drugs," his character, Luke Remsen, insists, but they must have something on him since he's been brought in for interrogation.

But it's not all doom and gloom. Also in this episode, Rollins (Kelli Giddish) receives some good news.

Law & Order: SVU, Thursdays, 10/9c, NBC

Law & Order SVU Season 21 Episode 19 Mariska Hargitay Kelli Giddish
Heidi Gutman/NBC

Olivia (Mariska Hargitay) and Rollins (Kelli Giddish)

Madison Ferris Law & Order SVU Season 21 Episode 19 Piper Knight
Virginia Sherwood/NBC

Madison Ferris guest stars as Piper Knight.

Mariska Hargitay Law & Order SVU Season 21 Episode 19 Olivia Benson
Virginia Sherwood/NBC

Olivia

Law & Order SVU Season 21 Episode 19 Rollins Olivia
Virginia Sherwood/NBC

Rollins and Olivia, with Piper and Gail Knight (Michele Pawk)

Kelli Giddish Law & Order SVU Season 21 Episode 19 Amanda Rollins
Virginia Sherwood/NBC

Rollins

Peter Scanavino Law & Order SVU Season 21 Episode 19 Carisi
Virginia Sherwood/NBC

Carisi (Peter Scanavino)

Carisi Rollins Law & Order SVU Season 21 Episode 19 Olivia
Virginia Sherwood/NBC

Carisi, Olivia, and Rollins

Ice T Jamie Gray Hyder Mariska Hargitay Law & Order SVU Season 21 Episode 19
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Fin (Ice T), Kat (Jamie Gray Hyder), and Olivia

Eddie Kaye Thomas Law & Order SVU Season 21 Episode 19 Ice T
Heidi Gutman/NBC

Eddie Kaye Thomas guest stars as Luke Remsen.