The fourth and final season of The Righteous Gemstones opened in unexpected fashion, leaving fans momentarily confused as the HBO comedy took a dramatic turn. Instead of reuniting with the dysfunctional televangelist family, audiences were introduced to a Civil War-era narrative led by Bradley Cooper in a role unlike anything the show had done before.

Titled Prelude, the season premiere steps back to 1862 and follows Elijah Gemstone, a crook-turned-preacher who finds himself in a Confederate unit after killing and impersonating a pastor. The episode, featuring graphic violence and historical drama, unfolds without a single appearance from the present-day Gemstone family, a bold creative risk for a show known for its ensemble cast.

Series creator Danny McBride acknowledged the challenge of introducing an entirely different setting and protagonist after a long break between seasons. “There are so many incredible actors here that the audience is showing up for, and to invite...