"Law and Order: SVU" is bringing in Nia Vardalos for an episode tackling gay marriage laws in New York State.

In the exclusive preview clip of "Criminal Hated" below, Detectives Benson (Mariska Hargitay) and Amaro (Danny Pino) are doing an interrogation when Vardalos' Counselor Minonna Efron interrupts. It seems her client and the young man under interrogation aren't just boyfriends ... they're husbands.

"Law and Order: SVU" airs on Wednesday, Jan. 30 at 9 p.m. EST on NBC.

Check out NBC's official description of the episode below:

ADA BARBA TRIES A MURDER CASE AGAINST AN UNPREDICTABLE DEFENSE ATTORNEY (GUEST STAR NIA VARDALOS) IN A SHOWDOWN THAT STRETCHES THE BOUNDARIES OF THE LAW. The SVU detectives go undercover to arrest a man who targets and brutally attacks other men. They gather enough evidence for ADA Barba (Raul Esparza) to file charges, but the case begins to spiral as he contends with a deceptively tough defense attorney (guest star Vardalos.) Also starring Mariska Hargitay (Detective Olivia Benson), Ice-T (Detective Odafin Tutuola), Danny Pino (Detective Nick Amaro), and Kelli Giddish (Detective Amanda Rollins). Also guest starring Victoria Rowell (“The Young and The Restless”) and Fred Norris (“The Howard Stern Show”)

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  • "Law & Order: SVU" Season 15

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  • "Vanity's Bonfire"

    Jessica Hecht as Gillian Webster

  • "Vanity's Bonfire"

    Ice-T as Det. Odafin "Fin" Tutuola, Kelli Giddish as Detective Amanda Rollins

  • "Vanity's Bonfire"

    Scott Bakula as Kent Webster

  • "Vanity's Bonfire"

    Scott Bakula as Kent Webster

  • "Vanity's Bonfire"

    Scott Bakula as Kent Webster

  • 300th Episode Celebration

    "SVU's" 300th episode cake.

  • 300th Episode Celebration

    Dick Wolf and the cast of "SVU."

  • 300th Episode Celebration

    Co-Executive Producer Michael Smith, Executive Producer Julie Martin, Co-Executive Producer Ed Zuckerman, Ice-T as Detective Odafin 'Fin' Tutuola, Danny Pino as Detective Nick Amaro, Kelli Giddish as Detective Amanda Rollins, Dann Florek as Captain Donald Cragen, Executive Producer Dick Wolf, Richard Belzer as Detective John Munch, Mariska Hargitay as Detective Olivia Benson, Executive Producer Peter Jankowski, Co-Executive Producer Arthur Forney, Executive Producer Warren Leight.

  • 300th Episode Celebration

    Ice-T as Detective Odafin 'Fin' Tutuola, Danny Pino as Detective Nick Amaro, Kelli Giddish as Detective Amanda Rollins, Dann Florek as Captain Donald Cragen, Executive Producer Dick Wolf, Richard Belzer as Detective John Munch, Mariska Hargitay as Detective Olivia Benson, Executive Producer Warren Leight.

  • 300th Episode Celebration

    Mike Canosa from transportation, Production Accountant Greg Cattano, Executive Producer Peter Jankowski, Eddie Coonan of transportation, Dann Florek as Captain Donald Cregan, Executive Producer Dick Wolf, Richard Belzer as Detective John Munch, Mariska Hargitay as Detective Olivia Benson, Co-Executive Producer Arthur Forney, Director Jean DeSegonzac, John Raffone of transportation, Publicist Pam Golum -- "Law & Order: Special Victims Unit" celebrates 300 episodes with the current cast and crew who worked on episode 1.

  • 300th Episode Celebration

    The cast of "Law & Order: SVU."

  • 300th Episode Celebration

    The cast and crew of "Law & Order: Special Victims Unit" surround Executive Producer Dick Wolf to celebrate the 300th episode of the show.

  • 300th Episode Celebration

    Dick Wolf.

  • 300th Episode Celebration

    Richard Belzer, Dick Wolf & Mariska Hargitay.

  • 300th Episode Celebration

    Mariska Hargitay as Detective Olivia Benson, Co-Executive Producer Arthur Forney, Co-Producer/Casting Director Jonathan Strauss, Executive Producer Warren Leight.

  • 300th Episode Celebration

    Dick Wolf and the cast celebrate "SVU's" 300th episode.

  • Law and Order: SVU Season 14

    Mariska Hargitay as Detective Olivia Benson.

  • Law and Order: SVU Season 14

    Jason Cerbone as CEA Counselor Terrence Quinn, Dann Florek as Captain Donald Cragen.

  • Law and Order: SVU Season 14

    Dean Winters as Detective Brian Cassidy, Danny Pino as Detective Nick Amaro.

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