The publisher will team with Lucasfilm for a comic based on George Lucas's rough draft, called The Star Wars.
LucasBooks executive editor JW Rinzler will write the eight-issue series with Avengers artist Mike Mayhew.
"Three years before his 1977 film, George Lucas put down on paper his first story set in a galaxy far, far away - a tale of fantastic adventures, daring escapes, 'laser swords', romance, and monsters," said Dark Horse.
"A story of Jedi Annikin Starkiller and General Luke Skywalker, an alien named Han Solo, and evil Sith Knights. The screenplay was titled The Star Wars."
"I'm not sure where I first read about The Star Wars - it was years and years ago - but the idea of Luke Skywalker being an older Jedi General, and Han Solo being a six-foot-tall lizard, turned my Star Wars fan brain on its side," said editor Randy Stradley.
"I always assumed this would be one of those stories that would be 'lost to history', so getting to work on bringing it to life is kinda like a dream come true."
The Star Wars will launch in September.
Photo gallery - the Star Wars series: