A24 Drops Full Trailer for ‘Undertone’ Ahead of March 13 Theatrical Release

Terror seeps in through sound in A24’s unsettling horror film Undertone.

Undertone Drops Full Trailer — A24’s Sonic Nightmare Hits Theaters Friday the 13th

Some horrors don’t show themselves.

They listen.

A24 has released the full trailer for Undertone, the chilling feature debut from writer-director Ian Tuason, and it confirms what early whispers have been suggesting: this one is built to crawl under your skin and stay there. The film arrives exclusively in theaters Friday, March 13, and it’s already being labeled as one of the standout horror films of 2026.

Starring Nina Kiri and Adam DiMarco, Undertone centers on the host of a popular paranormal podcast whose obsession with unexplained phenomena takes a deeply personal turn. When she’s mysteriously sent ten audio recordings, what begins as curiosity quickly mutates into dread. With each clip, terror escalates, reality destabilizes, and fractures begin forming between friends, collaborators, and listeners alike.

The new trailer leans hard into atmosphere and sound design, emphasizing the idea that this horror isn’t about what you see—it’s about what you hear, what you replay, and what you can’t unhear once it’s inside your head. The podcast setup gives the film a modern entry point, but the fear feels old, primal, and invasive, rooted in the kind of auditory paranoia that makes silence feel unsafe.

Joining Kiri and DiMarco are Michèle Duquet, Keana Lyn Bastidas, and Jeff Yung, rounding out a cast tasked with selling a story where tension spreads through voices, headphones, and unseen presence rather than traditional jump-scare theatrics.

Tuason’s approach appears precise and confident, trusting sound, pacing, and psychological pressure to do the heavy lifting. If the trailer is any indication, Undertone understands that fear doesn’t need spectacle—it needs access.

This is the kind of horror that thrives in a dark theater, where every breath, whisper, and low-frequency hum can get to work on you without interruption.

Undertone opens only in theaters on Friday, March 13, from A24.

Watch the trailer—but be careful what you listen to.