The cast of 'Oppenheimer' wore daring looks before walking out of the film's world premiere amid the SAG-AFTRA strike

Christopher Nolan's "Oppenheimer" premiered in London on Thursday, with the stars of the film in attendance to promote the film.

But after walking the red carpet, the cast left the event to support the SAG-AFTRA strike, as Christopher Nolan announced on the premiere stage, according to Deadline.

SAG-AFTRA called for the strike on Thursday after its national board of directors voted unanimously to approve it, as The Los Angeles Times reported, joining the writers' strike that has been underway since May 2.

Blunt, who plays J. Robert Oppenheimer's wife Kitty in the film, walked the red carpet in a black, sparkly dress from Alexander McQueen.

The gown's padded shoulders flowed into a cutout, asymmetrical neckline that exposed Blunt's stomach.

A pattern of white embroidery swooped across the side of the gown, and the skirt flowed into fringes of fabric that moved and showed her legs as she walked.

Damon's black suit and coordinating vest looked simple at first glance, but he paired the traditional look with a T-shirt and no tie, giving it a modern edge.

The actor plays Leslie Groves, a general, in the film.

Murphy paired an open jacket with high-waisted pants and a see-through, black top from Saint Laurent, an unexpected addition to the all-black look.

He plays the titular character in Nolan's film.

Pugh, who plays Oppenheimer's student and lover Jean Tatlock, often wears daring looks on red carpets, and the "Oppenheimer" premiere was no exception.

The halter neckline of the actor's burnt-orange, Valentino gown dipped all the way to her navel, meeting the form-fitting bodice in a point. Two cutouts framed the sides, and the dropped-waist skirt flowed out around her.

Only a thin strap of fabric kept Pugh's dress together in the back.

The open back drew the eye to the gown's skirt, which flowed into a dramatic train.

Malek, who plays nuclear physicist David Hill in the film, attended the premiere in a black top and pants.

The shirt was buttoned to the neck with no tie and he wore no jacket, creating an effortless and sophisticated look.

Hartnett's steel-gray suit consisted of an oversized jacket and flared pants that gave the outfit a '70s feel. He paired it with a pale-blue top that had an oversized collar, and he left the top halfway unbuttoned.

He plays physicist Ernest Lawrence in Nolan's film.