After the death of his identical twin, Roman (Dylan O’Brien) joins a support group for twinless twins. There, he strikes up a friendship with Dennis (James Sweeney), who is uncannily similar to Roman’s late brother Rocky, who was gay, smart, and social. After he meets Dennis’s coworker, Roman learns that he and Dennis are both harboring secrets that threaten to ruin their deep bond. Winner of the U.S. Dramatic Audience Award at the 2025 Sundance Film Festival, Twinless is a black comedy exploring grief and codependency.