'Star Wars: The Force Awakens' Documentary Shows Behind the Scenes Secrets

— -- If you think you know everything about "Star Wars: The Force Awakens," think again.

A new documentary premiering today at the South by Southwest festival in Austin, Texas, offers an inside look -- including never-before-seen footage -- at the making of the mega-blockbuster.

The documentary, "Secrets of The Force Awakens: A Cinematic Journey," even looks at the climactic final scene in "The Force Awakens" that broke fans' hearts. The movie's stars reveal it was just as tense for them to film as it was for the audience watching it.

"It was the scene that terrified me the most," Adam Driver, who plays the evil Kylo Ren, says in the documentary.

"His destiny is resolved in a powerful and effective way," says Harrison Ford, who reprised his role as Han Solo in the film. "I wanted Han Solo to be able to lend some significant emotional weight to the story."

The cast also recalls the thrill of working on the much-anticipated movie.

"I just remember thinking we are about to shoot this thing and I'm not ready," said "Star Wars" actress Daisy Ridley, who played Rey.

"I remember a specific time walking on set with Harrison and him saying, 'Look what we get to do,'" Driver said of his co-star, Ford.

Driver also says in the documentary that just the act of putting on his elaborate costume helped him get into character.

"Putting it on, it was like such an event,. I was so pissed by the time we were ready to start shooting that I felt totally ready," he said.

The film's director, J.J. Abrams, reveals in the documentary how Captain Phasma got her name.

"The name came because, looking at chrome design of Phasma's uniform, it reminded me of the movie 'Phantasm,'" Abrams says. "There's this chrome ball, this kind of Devil ball with spikes on it. I always loved the design of that, so when we were looking at this, I thought, you know, 'Phantasm' and Phasma."

That documentary is one of many extras that will be released next month on the digital and Blu-ray versions of "Star Wars: The Force Awakens."

"Star Wars: The Force Awakens" is produced by Lucasfilm, a subsidiary of Disney, which is the parent company of ABC News.