The Righteous Gemstones’ final season is going big with new cast additions. Deadline reports that Megan Mullally (Will & Grace) and Seann William Scott (Shifting Gears) are joining Season 4 of the HBO comedy as a mother-son duo with connections to the illustrious Gemstone family.

"The Righteous Gemstones," a comedy-drama series created by and starring Danny McBride, will return for a fourth and final season in March.

HBO has released the teaser for the fourth and final season of its Original series The Righteous Gemstones, which will debut on March 9.

Gemstones has become an HBO fan favorite over its last three seasons. The comedy follows a family of wealthy televangelists, played by John Goodman, Adam Devine, Edi Patterson, and McBride. The show satirizes the excessive culture of American megachurches as the dysfunctional family squabbles for power within the empire they’ve built.

HBO has set the official premiere date for the final season of “The Righteous Gemstones.” The comedy series returns with new episodes on March 9. As Variety previously reported, the fourth season of the popular series will be its last.

HBO has set Sunday, March 9 for the premiere of the nine-episode, fourth and final season of The Righteous Gemstones. Created, written and executive produced by Danny McBride, who also stars, The Righteous Gemstones tells the story of a world-famous televangelist family with a long tradition of deviance,

The upcoming Season 4 of HBO series The Righteous Gemstones will be the last for the Charleston-filmed show. The final episodes will become available in March.

The teaser kicks off with a discussion about Baby Billy Freeman's (Walton Goggins, Fallout) upcoming young adult TV series about Jesus as a teenager. He's shortened the title from

Praise the heavens, we have a premiere date for the fourth and final season of "The Righteous Gemstones." The Danny McBride comedy will premiere on HBO and Max on March 9. Watch the first teaser for this new season below: More to come