The Hamptons International Film Festival has lined up two Sundance alums and one SXSW film for its annual SummerDocs series of documentary screenings, launching with Robert Gordon and Morgan Neville’s TV news tale “Best of Enemies.”

Stevan Riley’s film about Marlon Brando, “Listen to Me Marlon,” also is on the list, as is Brad Barber and Scott Christopherson’s “Peace Officer.”

“Best of Enemies,” which premiered at Sundance, centers on the 1968 debates that aired on ABC between conservative William F. Buckley Jr. and Democrat Gore Vidal, events that became foundational moments in the advent of pundit TV. Dick Cavett and the film’s two directors will be on hand for a public conversation following the film’s SummerDocs screening July 11.

“Listen to Me Marlon,” another Sundance title, explores the enigmatic persona of Brando. After that screening on Aug. 1, Alec Baldwin will lead a talk with the movie’s director.

Baldwin also will be there to interview the director of “Peace Officer” after its Aug. 28 screening. That movie centers on a former sheriff who trained the SWAT team that ended up killing his son-in-law 30 years later.

All three screenings in the SummerDocs series take place at Guild Hall in East Hampton, New York. The 23rd Hamptons International Film Festival will run over Columbus Day weekend, Oct. 8-12.