Ruth Negga (‘Preacher,’ ‘Loving’) is headed into space with Brad Pitt, with THR bringing news that Irish actress has joined the cast of James Gray’s ‘Heart Of Darkness’-esque sci-fi ‘Ad Astra.’

As previously reported, the film sees Pitt playing Roy McBride, a “slightly autistic” space engineer on a mission through a lawless and unforgiving solar system in search for his father, who disappeared on a one-way mission to find signs of alien life 20 years ago.

Tommy Lee Jones also stars, playing the missing father. Negga’s role on the project is unknown.

Principal photography gets underway in September with Gray directing from a script he co-wrote with Ethan Gross (‘Fringe’).