It’s almost evening when the much-honored Broadway cast of Yasmina Reza’s “God of Carnage” finishes rehearsal in a 42nd Street studio and moves across the room to talk about its forthcoming reunion at Los Angeles’ Ahmanson Theatre.

Jeff Daniels, Hope Davis, James Gandolfini and Marcia Gay Harden are back in the roles for which each was nominated for a 2009 Tony award. The play, translated from the French by Christopher Hampton, took home Tonys for best play, actress Harden and director Matthew Warchus. “God of Carnage” opens Wednesday at the Ahmanson and has already announced an extension to May 29.

In an upscale Brooklyn neighborhood park, 11-year old Benjamin hits playmate Henry in the face with a stick, breaking two teeth. The victim’s parents, played by Gandolfini and Harden, invite the perp’s parents, played by Davis and Daniels, to their home to discuss the altercation. As civility gives way to chaos, Daniels, as an unprincipled, cellphone-dependent lawyer, is but the most blatant boor in Reza’s comedy of very bad manners. The only thing left standing at the play’s conclusion is the set, and it’s been through plenty as well.

Different casts populate productions of “God of Carnage” around the world, and Roman Polanski is filming his version, also with a different cast. (Beyond a perfunctory “I wish them luck” from Gandolfini, these players have no comment on the film.)

All of “Carnage’s” high-profile cast members are parents, with a total of nine children among them. In many ways, they perform like a family as they talk with The Times.