Christina Hendricks has joined the cast of the upcoming drama Hap and Leonard, SundanceTV said.

The Mad Men alum joins previously announced cast members James Purefoy, Michael Kenneth Williams, Bill Sage and Jimmi Simpson for the series. Six one-hour episodes of the show's first season are to air in early 2016.

Based on Joe Lansdale's Hap and Leonard books and short stories, the program focuses on Hap -- a white, working-class laborer, who spent time in federal prison for refusing to be drafted into the military and serve in the Vietnam War.

"Now in his 40s, he is just barely making ends meet, picking roses on an East Texas plantation," a synopsis said. "His confidante and lifelong best friend is Leonard -- an openly gay, black Vietnam vet with anger issues. Having been raised by an uncle who shunned him after learning he was gay, Leonard's only support in the not-so-progressive, rural South is Hap. Together, they struggle through misadventure in a bid to stay on the right side of the law in 1980s East Texas."

Hendricks will play Hap's ex-wife Trudy, "who resurfaces after two years with a proposition for Hap that he cannot refuse."