'Luther' creator has 'no idea' how he convinced Netflix to let him do 'audacious' action scenes in 'The Fallen Sun'

• Creator Neil Cross spoke to Insider at the world premiere of "Luther: The Fallen Sun" in London.
• Cross joked that he has "no idea" how Netflix let him do the biggest scenes in the film.
• Cross also said that the dark movie is "never exploitative" with its violence.

After five seasons on the small screen, Idris Elba has finally been able to give fans the "Luther" movie he's talked about making for years.

Netflix's "Luther: The Fallen Sun" follows the titular detective as he clashes with twisted serial killer David Robey (Andy Serkis), who holds the key to a digital underworld of depravity.

The movie stays faithful to the street-level drama of the BBC series, but it includes some much bigger action sequences that showcase Luther's unstoppable determination.

Idris Elba told Insider at the movie's world premiere last week that his favorite moment during filming was brawling his way through a prison in a riotous extended scene.

Creator Neil Cross also spoke to Insider about what it was like making the jump to the big screen, explaining on the red carpet that he found it "liberating" to come up with "audacious" set pieces.

He said: "It was just fun. If we want, without spoilers, to stage a big audacious set piece in Piccadilly Circus, well, by God, we're going to. I would say it was liberating and it was fun."

Cross joked that he has "no idea" how he convinced Netflix to let him write huge action scenes as well as take Luther to Norway for the film's dramatic climax.

"I honestly have no idea. I have to say that Netflix from the get-go were astonishingly trusting in us. They trusted our taste levels and our judgment because we're always keeping it very dark," said the film's writer.

The creator added that the movie isn't "exploitative" with its violence, saying that Netflix was understanding of Luther's story, and where it ends up.

"It's never exploitative. It's always hopefully entertaining, and I don't want to use the word redemptive, but you know... we don't always end in too dark of a place. And Netflix were very accommodating," Cross said. 

Cross also teased that this isn't the end for Luther, suggesting that there are bigger things on the horizon for the detective after the end of "The Fallen Sun."

"The intention, again, without spoilers, is so Luther is always developing and he's always stepping into slightly new worlds and slightly new situations," said the writer. "We just wanted to end in such a way as to kind of nudge open the door, and invite you to look behind the door and what might be behind it…"

"Luther: The Fallen Sun" is now streaming on Netflix.