"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.

Danny McBride on collaborating with his 'Aloha' costar for th ambitious Civil War-themed prologue that opens the show's fourth and final season

I sent him the script and he called me back pretty quickly,” McBride tells PEOPLE before explaining what happened nextBradley Cooper may have needed just a little nudge to sign on to appear in the fourth and final season of The Righteous Gemstones.