The darkly passionate drama will be directed by Daniel Aukin (Proof). Performances will run through Aug. 2 on the Nikos Stage.
Pine and Ambrose were originally announced to headline the production in March, but departed the production due to scheduling conflicts. Arianda (Venus in Fur) and Rockwell (A Behanding in Spokane) join Christopher Abbott ("Girls") and Tony nominee Gordon Joseph Weiss (A Fable, Ghetto).
Here's how Williamstown bills the play: "Holed up in a seedy motel on the edge of the Mojave Desert, two former lovers unpack the deep secrets and dark desires of their tangled relationship, passionately tearing each other apart. Beaten down by ill-fated love and a ruthless struggle for identity, can they ultimately live with, or without, each other?"