The fourth and final season of "The Righteous Gemstones" has finally arrived on HBO. With the final season comes new responsibility for the Gemstone kids. They finally have what they want – control of the family megachurch - but leadership turns out to be a lot more difficult than any of them expected.

"I never thought we’d get a guy of his stature to wear a period piece wool costume in 90 degree weather for 10 days straight," McBride says of casting his surprise Civil War-set final season opener. "And for no money.