Actresses Jyoti Amge and Erika Ervin attend the premiere of FX's "American Horror Story: Freak Show" on Oct. 5, 2014, in Hollywood, California. Kevin Winter/Getty Images

The red carpet was rolled out in Los Angeles on Sunday for the premiere of "Freak Show," the fourth season of the "American Horror Story" anthology series.

Co-creator Ryan Murphy said Lange came up with this season's concept.

"I think back in season one, she said, 'We've got to do carnival, freak shows,' and she kept sending me books," he revealed on the red carpet.

This "AHS" chapter -- set in Jupiter, Florida, in 1952 -- revolves around one of the last touring companies of physically different humans. The attraction includes a bearded lady and a woman with three breasts.

The problem is that business is bad, forcing owner Elsa Mars (portrayed by Lange) to go to great lengths to assure that the show goes on.

With his creative partner Brad Falchuk, Murphy eventually embraced the idea. He wanted this season to imbue a spooky, early 1950s sci-fi feel, and he wanted to give cast member Sarah Paulson an impossible role.

She plays the characters of Bette and Dot Tattler, conjoined twins who may be the star attraction that Elsa's show desperately needs.

Paulson called the roles "the most difficult thing I've ever done in my life."

She said the characters' heads can't turn to look into each other's eyes.

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"AHS: Freak Show" gets red carpet treatment