Leonardo DiCaprio plans to go all out in his new project that could potentially be the actor's most impressive acting venture yet.

He will be portraying Billy Milligan, the first person to ever plead to a multiple personality disorder, in a film called 'The Crowded Room'. Milligan reportedly had 24 different personalities living in his head.

The film will be adapted from the 1981 non-fiction novel, 'The Minds of Billy Milligan' by Daniel Keyes.

It has been revealed that DiCaprio has been looking to play this role for over 20 years, and it's suspected that it may be the film that awards the talented actor his first ever Oscar, something that has alluded him for many years.

Here is the book's synopsis:

"Out of control of his own actions, Billy Milligan was a man tormented by twenty-four distinct personalities battling for supremacy over his body - a battle that culminated when he awoke in jail, arrested for the kidnap and rape of three women. In a landmark trial, Billy was acquitted of his crimes by reason of insanity caused by multiple personality - the first such decision in history - bringing to public light the most remarkable and harrowing case of multiple personality ever recorded.

Twenty-four people live inside Billy Milligan."

"Philip, a petty criminal; Kevin, who dealt drugs and masterminded a drugstore robbery; April whose only ambition was to kill Billy's stepfather; Adalana, the shy, lonely, affection-starved lesbian who 'used' Billy's body in the rapes that led to his arrest; David, the eight-year-old 'keeper of pain'; Arthur, the Englishman; Ragen, the 'keeper of Rage' who possessed incredible strength; Allen, the con man; Tommy, the escape-artist, and all of the others, including men, women, several children, both boys and girls, and the Teacher, the only one who can put them all together. Each of these 'people' play a distinct role in this often shocking true story."