Plot details are thin on the ground for the time being – shooting only finished two months ago – but what we do know is that Belfast also features the likes of Dame Judi Dench, Game of Thrones star Ciarán Hinds and Outlander's Caitriona Balfe.
Human Swiss Army knife Kenneth Branagh writes and directs, too.
"It's very exciting. I probably can't say too much about it, but it's about the city that I'm from, Belfast," Dornan told The Hollywood Reporter in a recent interview.
"That's also the city that Ken Branagh is from. And what I think I'm allowed to say is that it somewhat chronicles a part of Ken's early life in Belfast.
"Judi Dench plays my mother, and Ciarán Hinds plays my father. Caitriona Balfe also plays my wife, and there are a couple of young, brilliant actors in there. We got to shoot it during the pandemic, which was weird," he added.
Expanding on that aspect of the shoot, the Synchronic star also shared: "We got Covid tests every day, and everyone was wearing masks. I feel like Ken and I are quite close, but I kind of never saw the bottom half of his face. It was quite strange.
"It's tonally something very different than anything that anybody's seen me in before, and yeah, I'm really excited. I'm actually so excited to see a cut of it next week because I had a brilliant time making it."
Belfast will be released in 2021.
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