Watch Eerie Trailer for J.J. Abrams Quasi-Sequel '10 Cloverfield Lane'

Rumors of a sequel to Cloverfield, the 2008 found-footage monster thriller produced by J.J. Abrams, have been circulating since the film premiered. Now a trailer for 10 Cloverfield Lane, the project's "blood relative," has debuted, presenting a post-apocalyptic scenario in which a character played by John Goodman seemingly holds a woman (Mary Elizabeth Winstead) and man (John Gallagher Jr.) captive in an underground cellar. 

The clip opens with a normal-looking night at home, with the trio listening to music and doing puzzles. Suddenly the room begins to shake, which prompts Winstead's character to climb toward escape. "Don't open that door – you're going to get all of us killed!" Goodman exclaims. Winstead glimpses an outside world – assumedly an ominous one – we can't see, as Goodman warns at the climax, "Something's coming."

10 Cloverfield Lane was produced by Abrams and directed by Dan Trachtenberg from a screenplay by Josh Campbell, Matt Stuecken and Damien Chazelle. It hits theaters on March 11th.

Just like the original Cloverfield, the project has been veiled in secrecy. News broke in 2014 about a post-apocalyptic thriller directed by Trachtenberg, though under previous titles The Cellar and Valencia to keep the "sequel" connection under wraps. Fans only learned the true title upon seeing the trailer during recent screenings of Michael Bay's 13 Hours. 

"The idea came up a long time ago during production. We wanted to make it a blood relative of Cloverfield," Abrams said in a statement to Collider. "The idea was developed over time. We wanted to hold back the title for as long as possible."

However, it remains unclear how the two films are connected. 10 Cloverfield Lane appears to use a more traditional visual style and narrative than the original's found-footage format, and the trailer doesn't offer any clues about the overall setting or the identity of that evil threat outside.