Dylan O’Brien’s 'Twinless' Drops Official Trailer Ahead of September Release

Dylan O’Brien takes on dual roles in ‘Twinless’, a dark comedy from James Sweeney, with a new trailer out now.
 Dylan O’Brien stars in the upcoming film Twinless, which just released its official trailer ahead of its theatrical debut on September 5, 2025, via Lionsgate and Roadside Attractions. The film is written and directed by
Dylan O’Brien stars in the upcoming film Twinless, which just released its official trailer ahead of its theatrical debut on September 5, 2025, via Lionsgate and Roadside Attractions. The film is written and directed by  James Sweeney, who also appears in the cast.
James Sweeney, who also appears in the cast.
In Twinless, O’Brien plays Roman, a man grieving the sudden death of his twin brother Rocky—also played by O’Brien. Roman meets Dennis (Sweeney) at a support group for people who have lost a twin. Their bond starts to shift when Roman meets Dennis’s upbeat co-worker Marcie, played by  Aisling Franciosi, and things get complicated.
Aisling Franciosi, and things get complicated.
The film premiered at the 2025 Sundance Film Festival, where it received attention after clips were leaked online. The cast also includes  Lauren Graham,
Lauren Graham,  Tasha Smith,
Tasha Smith,  Chris Perfetti, and
Chris Perfetti, and  François Arnaud. Twinless is produced by David Permut, James Sweeney, and Alex Astrachan, with Dylan O’Brien also credited as an executive producer.
François Arnaud. Twinless is produced by David Permut, James Sweeney, and Alex Astrachan, with Dylan O’Brien also credited as an executive producer.