‘Twinless’ Trailer – Dylan O’Brien Stars in James Sweeney’s Sundance Winning Indie Dramedy Film

The official trailer is here for Twinless, a sharp, emotionally charged indie dramedy film written and directed by James Sweeney. At its center is Dylan O’Brien, who delivers a mesmerizing dual performance as twin brothers Roman and Rocky. Sweeney himself stars as Dennis, the man Roman meets in a twin‑loss support group. Rounding out the ensemble are Aisling Franciosi, Lauren Graham, Chris Perfetti, and Tasha Smith

Twinless made its world premiere in the U.S. Dramatic Competition at the 2025 Sundance Film Festival, where it won the Audience Award and Dylan O’Brien received a Special Jury Award for Acting. It also screened at Tribeca Film Festival in June 2025. Lionsgate and Roadside Attractions will release Twinless in theaters on September 5th.

Here’s the official synopsis:

In Twinless, two young men meet in a twin support group and form an unlikely friendship. Roman (Dylan O’Brien) and Dennis (James Sweeney) both search for solace and an identity without their other halves and soon become inseparable outside the group. But when Roman meets Dennis’ ebullient co-worker, Marcie (Aisling Franciosi), all is revealed to be not what it seems, as each man harbors secrets that could unravel everything.

Critics are raving. The Guardian review gave the ‘dark, inventive comedy’ 4 of 5 stars, writing, “Sweeney’s smart and highly unusual film earns its boundary-pushing because he never loses sight of the inescapable, human sadness at its core. For all of its themes of identical mental and physical connection, Twinless is a true original.”

Watch the official trailer for Twinless.