Justin Long is to find screen romance with Emmy Rossum in Comet.
The quirky indie comedy, which is set in a parallel universe, will follow the couple as they embark on an "unlikely but perfectly paired" six-year relationship.
"Comet is about the drama, comedy and utterly surreal state of heartbreak - a subject in which I am well versed," writer-director Sam Esmail told Deadline.
Justin, who has appeared in Dodgeball: A True Underdog Story, Die Hard 4.0 and He's Just Not That Into You, premiered his new film In Case Of You, which he co-wrote and produced, at the Tribeca Film Festival in New York.
Emmy, who portrays Fiona Gallagher in the US version of Shameless, will next be seen on the big screen in drama You're Not You alongside Hilary Swank.