Summit Entertainment is rounding out the cast of action-adventure “Divergent” with Ben Lloyd-Hughes, Ben Lamb and Christian Madsen.

The trio join Shailene Woodley and Theo James, who are in the lead roles, along with Kate Winslet, Jai Courtney, Zoe Kravitz, Ansel Elgort and Maggie Q. Lensing begins next month in Chicago with Neil Burger directing from Vanessa Taylor’s adaptation of the first novel of Veronica Roth’s trilogy.

“Divergent” has been dated for release on March 21, 2014. It’s being developed as Lionsgate’s next potential young-adult franchise along the lines of “Twilight” and “The Hunger Games.”

Movie is set in a post-apocalyptic Chicago divided into five factions. Lloyd-Hughes and Madsen will portray characters in the Dauntless faction.

Doug Wick and Lucy Fisher are producing through their Red Wagon Entertainment banner along with Pouya Shahbazian. Red Wagon’s Rachel Shane is exec producing.

Lloyd-Hughes appeared in “Great Expectations.” Lamb is in “The White Queen.” Madsen just wrapped Gia Coppola’s “Palo Alto.”

Lloyd-Hughes is represented by CAA. Lamb is represented by WME. Both Lloyd-Hughes and Lamb are managed by Lena Roklin. Madsen is represented by DBA-Fortitude and managed by Chris Prapha of Creative Partners Group.