‘The Blacklist’ Season 4 Spoilers: New Trailer Hints Red Is Liz's Real Father? More Shocking Twists Teased [WATCH]

“The Blacklist” Season 4 will finally reveal the truth about Elizabeth Keen’s (Megan Boone) parentage.

In “The Blacklist” Season 3 finale, Liz tried to fake her own death in order to get away from Raymond “Red” Reddington (James Spader) and bring her husband Tom Keen (Ryan Eggold) and their newborn daughter Agnes to Cuba. However, Alexander Kirk (Ulrich Thomsen) abducted Liz and and told her that he is her long-lost biological father. The latest trailer for “The Blacklist” Season 4 hints that both she and the viewers will finally learn if Kirk was telling the truth last season.

The preview opens with Liz telling Red that the only memory she has of her father was the night of the fire that ravaged her home years ago. Red then tells her that her father is dead and was unable to survive the fire. “You were there, weren’t you? The night of the fire?” Liz asks Red, to which he admits that he did witness the tragic incident that left her an orphan. Red’s bare back then flashes on screen, showing that most of his skin is covered with burn scars. This hints that Red did not only see the fire, but he was likely in the house with Liz and father when it happened.

The new trailer also teases that Kirk could indeed be lying about his claim and that Liz’s real father could be a different man. “Alexander Kirk is fundamentally dishonest,” Red tries to impress on Liz, presumably attempting to convince her not to buy his longtime nemesis’ revelation.

Liz, however, appears to be doubting both Kirk and Red, so she tells the latter, “I’m going to find out the truth.” Red then replies, “I’m sure you will, Lizzie.”

But while the new trailer casts doubt on Liz’s parentage again, “The Blacklist” executive producers Jon Bokenkamp and John Eisendrath previously said that there was no reason to doubt Kirk’s revelation in the Season 3 finale.

“I don’t know why we wouldn’t believe him. Red’s said before that he’s not Liz’s father. [Kirk] shows up in her life and says he’s her father. Liz should take him at his word. She thought she shot her father. It raises a number of questions, which is going to be the joy of Season 4,” Bokenkamp told Entertainment Weekly in May.

“We cannot unpack a story point like she thinks she shot her father and then introduce a new element that completely negates it, because that would damage our relationship with the audience and their trust in the story that we’re telling. All of the things that you would point to and add up on one side of the ledger that might discount this guy’s story about his being her father, we are responsible for next year and in years to come to incorporate it into the story that we’ve already told,” Eisendrath added.

According to the execs, what remains unclear is what Kirk’s motives were when he approached Liz and introduced himself as her father after all these years. “He says he’s her father, but is he going to hurt her, help her, be kind to her, or does he want to destroy her? ” Eisendrath said.

Find out who Liz’s real father is when “The Blacklist” Season 4 premieres on Thursday, Sept. 22 at 10 p.m. ET on NBC.