LOS ANGELES — A decade since George Lucas said “Star Wars” was finished on the big screen, a new trilogy under new ownership is destined for theaters after The Walt Disney Co. announced Tuesday that it was buying Lucasfilm Ltd. from him for $4.05 billion.

The seventh movie, with a working title of “Episode 7,” is set for release in 2015. Episodes 8 and 9 will follow. The trilogy will continue the story of Luke Skywalker, Han Solo and Princess Leia beyond “Return of the Jedi,” the third film released and the sixth in the saga. After that, Disney plans a new “Star Wars” movie every two or three years. Lucas will serve as creative consultant in the new movies.

“I’m doing this so that the films will have a longer life,” Lucas, the 68-year-old creator of the series and sole owner of Lucasfilm, said in an interview posted on YouTube. “I get to be a fan now. … I sort of look forward to it. It’s a lot more fun actually, than actually having to go out into the mud and snow.”

Disney CEO Bob Iger said Lucasfilm had already developed an extensive story line on the next trilogy, and “Episode 7” was now in early-stage development. He said he talked with Lucas about buying the company from him a year and a half ago, but they didn’t decide on a deal until recently as Lucas set in motion his retirement.

“The last ‘Star Wars’ movie release was 2005’s ‘Revenge of the Sith’ — and we believe there’s substantial pent-up demand,” Iger said.

The blockbuster deal announced Tuesday will see Disney pay half the acquisition price in cash and half in newly issued stock. The company expects it to add to earnings in 2015.