Austin Butler says he was hospitalized after wrapping it on his "Elvis" movie.

During an interview with GQ Hype, the 30-year-old revealed how much he had prepared

The role and the consequences it could take for his health to suffer.

Butler said, "Who can you really lose touch with. And I certainly had when I finished Elvis — not knowing who I was."

He even said that his preparation involves looking for unconventional methods, such as studying animal behavior.

He has cat-like things, like when a lion looks at the prairie,” he explained of the footage of Elvis.

This is the quality of a crocodile when it comes up from under water.

Eventually, after losing himself in Elvis, he sought the advice of veteran co-star Tom Hanks