Austin Butler said he had a dialect coach to help him get rid of his "Elvis" accent.
The actor worked on the Elvis Presley biopic with director Baz Luhrmann for three years.
Butler said he only had a week between finishing "Elvis" and filming "Masters of the Air."
On Wednesday's episode of "The Late Show with Stephen Colbert," Butler recalled the difficulty he had jumping from "Elvis" to starting work on Apple TV+'s World War II drama, "Masters of the Air."
The star said he had just a week between the two projects, and struggled to shake off his memorable role as Elvis.
"I had a dialect coach just to help me not sound like Elvis," Butler said.
"I was just trying to remember who I was. I was trying to remember what I liked to do. All I thought about for three years was Elvis. And then I have that week off," he continued.
"And then I flew to London, and at that time it was COVID, so I was quarantined for 10 days. I thought, 'Alright, just pour all this energy into learning about World War II,'" Butler added.
While promoting "Elvis" in 2022, Butler notably continued to speak in Presley's distinctive southern accent, which became something of a social-media meme.
"At this point, I keep asking people, 'Is this my voice?'" Butler told Entertainment Tonight in June 2022. "It's one of those things where certain things trigger it. When you live with something for two years, and you do nothing else, I think that you can't help it. It becomes a fiber of your being."
Butler later told reporters backstage at the 2023 Golden Globes: "I don't think I sound like him still, but I guess I must because I hear it all the time."
"I often liken it to when somebody lives in another country for a long time. I had three years where that was my only focus, so I'm sure there's pieces of him in my DNA and I will always be linked to him," he added.
In February 2023, Butler said he was finally "getting rid of the accent."
Butler, who is also in the upcoming "Dune: Part Two," noted on "The Late Show" that the "Masters of the Air" cast were taught how to fly, which helped get him into character.
"At the time, I really believed I could fly a plane. Yeah, we had a pilot there who taught us. We had flight simulators," Butler said.
After making the new series, Butler also joked that he would be confident flying a plane in real life.
"It probably wouldn't be safe, but I think I have the confidence. Tom Cruise would probably be a lot better, I would trust him for sure," he said.
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