“Downton Abbey” star Michelle Dockery has been cast as the female lead in Netflix’s upcoming mini-series “Godless.” She joins previously announced cast members Jeff Daniels and Jack O’Connell.

“Godless” tells the story of Frank Griffin (Daniels), an outlaw who is terrorizing the West as he hunts down Roy Goode (O’Connell), his partner turned mortal enemy. While Roy hides at Alice Fletcher’s (Dockery) ranch, Frank’s chase leads him to the quiet town of La Belle, N.M. — which is mysteriously made up entirely of women.

The series is being executive produced by Steven Soderbergh; Scott Frank will pen, direct and exec produce the project along with Casey Silver.

“Godless,” which will film in Santa Fe, N.M., will worldwide on Netflix in 2017.

Dockery, who was nominated for her role on “Downton Abbey,” is also starring on TNT’s “Good Behavior,” which is set to premiere later this fall.

She...