'Twinless' trailer: Dylan O'Brien and James Sweeney form unlikely friendship

"When I first read it, first of all, I loved how complete it was. I feel like oftentimes as an actor, you get a script and it’s always contextualized with, 'They’re still doing work on it, but what do you think? And they want your commitment tomorrow, but they don’t have a draft.' It was really a complete piece, and I think I just felt a connectivity to the voice and the humor. And then I really enjoyed the ride that it took you on, the journey and sort of the themes of humanity woven throughout, using what I thought was just such a clever and fun kind of twist and twin centerpiece. But it’s not really what the film is about, at the end of the day. It’s about loss and relationships, friendship, and that emotionality woven throughout really struck me," O'Brien, who also executive produces, told Deadline. "Then, really as soon as I met James — well, after watching his first film, too, and seeing what a true filmmaker he was — I was just totally in and it just grew from there."

Lionsgate and Roadside Attractions will release Twinless in theaters on September 5.