EFEBy Helen Cook New York City, US

"A Mount Everest to climb" is how Javier Bardem described his role in "Being the Ricardos" on Thursday, starring alongside Nicole Kidman to tell the story of Hollywood power couple Desi Arnaz and Lucille Ball.

"When (the role) arrived, it arrived a month and a half in advance for me to prepare,” Bardem told Efe on the red carpet at Jazz at Lincoln Center, in the heart of Manhattan, New York, minutes before the film’s premiere.

"The challenge was precisely to relax, to go phrase by phrase, video to video, audio to audio (...) To gain, a little more every day, security of what this character could do," said the Spaniard, who added that for years he had wanted to get into the shoes of Cuban-American actor Arnaz.

For Bardem, Arnaz was a character "larger than life."

The couple were the stars of one the United States' best-known comedies, "I Love Lucy," which in the 1950s was faithfully followed by millions of viewers.

Hollywood veteran Kidman told reporters that Ball was "very complicated."

"Her marriage with Desi, as much as it didn't work out, I love that you see what came out of it," she said. "Because, okay, not all relationships are going to make it. But when a relationship like this gives you the jewels – the children – and then also the show, the creativity that came out of that… and I think you feel that."