James Gandolfini's son has revealed he underwent '86 hours of therapy' in order to play a young Tony Soprano in The Many Saints of Newark.
Michael Gandolfini decided to take on the role made famous by his late father in hit TV show The Sopranos, which came to an end in 2007.
However, in order to get into the mind of crime boss Tony, 22-year-old Michael spent hours and hours trying to understand him.
In an interview clip shown on Tuesday's Good Morning Britain, Michael explained: "Like not only was I so proud of my dad and David and what they had done.
"Like I had 86 hours of therapy sessions of a character. I had the insight to his mind of like, 'what are his triggers? What does he think about the world? What does he become?'
"And that was just a deep well of knowledge to be able to create a different version of this character."
Michael previously admitted he'd never seen a single episode of the Sopranos before he got the part.
The film is set in the 1960s, in Newark, New Jersey, against a backdrop of violence and unrest.
In 1967, there were four days of race riots, looting and arson in the city. More than 20 people died and hundreds were injured.
James' voice introduces the film saying: "When I was a kid, boys like me were brought up to follow codes."
Hot-headed teen Tony, dressed in a fleece-lined denim jacket, gets into a fight immediately.
The movie's name The Many Saints of Newark is a pun on a family name, Moltisanti, Italian for 'many saints'.
The Moltisantis are part of a local mafia in the New Jersey city and Christopher Moltisanti was famously bumped off by his uncle Tony.
The Many Saints of Newark is released in UK cinemas on September 22.
