The deal unites a boutique Northern California film studio that brought special effects into the digital era with a venerable Hollywood powerhouse that has shown a knack for getting the most out of big-name entertainment brands.
Disney plans to release at least three more films in the Star Wars sci-fi saga that ranks among the biggest movie franchises of all time, Chief Executive Bob Iger told analysts on Tuesday. The last "Star Wars" picture was "Revenge of the Sith" in 2005.
Although Lucas has in the past denied plans for any new "Star Wars" movies, he said in a video interview released Tuesday on Starwars.com that he had already created story treatments outlining three more films as well as many other Star Wars story lines.
Lucas, an icon in the industry known for exercising control over the most minute details of the fictional universe he created, will remain a creative consultant on the new films, although in the video interview he cast the sale as part of a long-held personal desire to exit the mainstream film industry.
In a statement on Tuesday, Lucas said: "It's now time for me to pass 'Star Wars' on to a new generation of filmmakers." He will become the second-largest individual holder of Disney shares, with a 2.2 per cent stake.
Disney will pay about half the purchase price in cash and issue about 40 million shares at closing.
"This is one of the greatest entertainment properties of all time," Iger said.
The agreement marks the third time in less than seven years that Disney has signed a massive deal to take over a beloved studio or character portfolio, part of its strategy to acquire brands that can be stretched across TV, movies, theme parks and the Internet.
In early 2006, Disney struck a deal to acquire "Toy Story" creator Pixar, and in the summer of 2009 it bought the comic book powerhouse Marvel.
Pixar was founded by Lucas but sold for scrap to Apple co-founder Steve Jobs, who turned it into a much-celebrated hit-maker. Lucas had more success with Industrial Light and Magic, the pioneering digital technology company behind the special effects of many major Hollywood movies.
Industrial Light and Magic and Lucasfilms' Skywalker Sound unit do much of their work for other studios and it was not clear how they might be melded with Disney operations.
Iger said no decision had been made on whether Lucasfilm would remain headquartered in San Francisco and neighboring Marin County, where Lucas lives, although the company said it would retain operations in Northern California.
The three Marin ranches that Lucas owns, two of which host Lucasfilm operations, are not part of the deal, a Lucasfilm spokeswoman said.