HBO plans to air a Frank Sinatra documentary directed by helmer Alex Gibney and produced by Alcon Entertainment’s new TV division.

The untitled doc, a four-hour miniseries, intends to be a personal examination of Sinatra’s life and music and will feature previously unseen footage, including industry and home movies as well as private and professional performances.

Frank Marshall, Nancy Sinatra and Charles Pignone will exec produce with Alcon Television prexy Sharon Hall and co-CEOs Broderick Johnson and Andrew Kosove. Producing with Alcon are Frank Sinatra Enterprises (a joint venture between the Sinatra Family and Warner Music Group), the Kennedy-Marshall Co. and Jigsaw Prods.

“Alex’s vision for this unique documentary is an exciting one,” Hall said, “taking viewers into the singular and extraordinary world created by one of the greatest entertainers the world has ever known.”

Alcon Television was formed last year to retain domestic and international rights for original programming as Alcon does with its feature productions.

“Although our primary business at Alcon Television is to develop, finance and produce scripted series for broadcast and cable television,” Hall said, “we were overwhelmed by the scope and depth of this incredible story, not to mention the opportunity to work with Alex and to partner with Kennedy-Marshall and Frank Sinatra Enterprises, on what is surely to be the definitive portrait of our era’s greatest performer.”