Depp has already shot his second dip into Hunter S Thompson's literary world, with Bruce Robinson directing the adaptation.
Aaron Eckhart, Amber Heard, Giovanni Ribisi and Richard Jenkins are all in the cast.
For her part, Heard was impressed by the time she spent on set: "It was an amazing experience. I’m a huge fan of Hunter S Thompson and I met with Johnny Depp about it and he was instrumental in casting me as Chenault, who plays Johnny’s character’s love interest.
"So I was playing his love interest along with Aaron Eckhart and there a slew of other brilliant filmmakers and actors in this movie and involved in this movie."