Bradley Cooper "fought" for his role in Limitless after he was blown away by the "unbelievable" script.
The actor plays a man who can access 100 per cent of the brain's power in the action thriller, based on a book by author Alan Glynn.
Cooper loved the script as soon as he read it - and he did everything possible to ensure he landed the lead role.
He tells Bbc Radio 1, "Instantly (I wanted the role) - I fought for it, I wanted to do it so badly. (Screenwriter) Leslie Dixon wrote an incredible script, an adaptation of a book called The Dark Fields by an Irish man named Alan Glynn. I loved it. The script just read like a house on fire, it was unbelievable.
"I thought, 'God, if anyone can ever capture that on film it'd be great'."