Following its acclaimed premiere at Sundance 2026, A24's horror film Undertone has shared another cryptic teaser on Twitter, heightening anticipation for its March 13 theatrical release. The clip features demonic flashes and paranormal events echoing The Poltergeist.
In the lead-up to its March 13, 2026, theatrical release, A24's Undertone—hailed as the scariest film at Sundance 2026—continues its enigmatic marketing with a new teaser posted on Twitter on March 5. The short, mysterious clip delivers rapid glimpses of demonic imagery, a chandelier swinging on its own, and a figure pressed against a television screen, evoking the supernatural domestic horrors of the 1982 classic The Poltergeist.
This teaser builds on prior previews and the film's buzz from its Sundance debut, where director Ian Tuason's found-audio horror earned critical praise for blending chilling sound design with emotional depth. The marketing strategy underscores A24's innovative approach to horror, positioning Undertone as a standout in the 2026 genre landscape amid strong early-year releases.