'Shades of Blue' Season 1 episode 6 spoilers: Wozniak seeks to bring down the FBI mole in ‘Fall of Man’ [VIDEOS]

"Shades of Blue" returns on Thursday, and the sixth installment promises another fast-paced and intense spectacle of secrets and schemes. Lieutenant Matt Wozniak (Ray Liotta) is determined to handle the covert FBI informant on his team, believing that it is Stuart Saperstein (Santino Fontana). Detective Harlee Santos (Jennifer Lopez), on the other hand, encounters a ghost in her past.

Episode 6 will also feature other “Shades of Blue” cast members including FBI Agent Robert Stahl (Warren Kole), Tony Espada (Vincent Laresca), Tess Nazario (Drea de Matteo), Marcus Tufo (Hampton Fluker), Michael Loman (Dayo Okeniyi) and Cristina Santos (Sarah Jeffery).

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Spoiler alert! This update contains more "Shades of Blue" spoilers. Read on at your own risk if you have not watched the latest episode.

TV Guide reports that on Thursday’s episode, Wozniak assumes that it is Saperstein who is working with the FBI to spy on his team. Meanwhile, Harlee meets her abusive ex-boyfriend, Miguel, who is in prison for murder charges. Miguel seeks Harlee’s help in finding the person responsible for the crime.

“Shades of Blue” also posted two teasers of the Feb. 11 episode on its official YouTube page. On the first sneak peek, Harlee is seen visiting Miguel in prison. She asks, “Why did you call me here Miguel?” He suspects that Harlee has a hand in putting him away. The next scene focuses on Harlee and Wozniak. Harlee wonders whether Wozniak got a lead on their rat. “I found him. It’s Saperstein,” Wozniak replies. Stahl figures on another part of the video, telling Harlee to convince Wozniak that he’s wrong. Harlee says it’s too late for that. The trailer wraps with Harlee who looks shocked at what she’s seeing.

The second preview video sheds more light on Wozniak’s discovery about Saperstein. “I watched him betray us,” Wozniak tells Harlee. She reports this development to the FBI. “Wozniak is convinced that Saperstein is the mole,” she says. “If I don’t get him out of here now, I might not get another chance.” In another scene, Saperstein is seen being arrested by the FBI for fraud, extortion and misconduct.

The next scene shows Miguel speaking to Harlee in prison. “I need you to find somebody. I don’t trust lawyers, and I don’t trust the police. I only trust you,” he says. Harlee appears on the doorstep of a man, who punches her after she shows her a police badge. In another part of the video, Saperstein is seen on a police car talking to Stahl and a female FBI agent. They tell him that Wozniak is on his way to question him. “And by question you, we mean shoot you in the head,” Stahl says. The teaser then shows several clips including Wozniak firing a gun, Saperstein stabbing Stahl and pointing a gun to his head, Harlee finding an injured woman who cries that someone has a gun. The preview video ends with a confrontation between Wozniak and Saperstein. “You’ve been talking to the feds,” Wozniak says. Saperstein replies that he had no choice.

Source: YouTube/Shades of Blue

Source: YouTube/Shades of Blue

Antonio Jaramillo has signed up to play Miguel Zepeda, according to IMDB. Other guest stars for Episode 6 include Annie Chang (Molly Chen), Owen Asztalos (Brian Kovach), Mark Deklin (Joe Nazario) and Kathryn Kates (Mrs. Saperstein).

Find out what happens next on “Shades of Blue,” which airs every Thursday at 10/9c on NBC.