He plays murder suspect Ig Perrish, who grows a pair of horns after a drunken night, and their paranormal powers help him hunt for the true killer of his girlfriend.

The actor has previously described the part as "deeply emotional and incredibly outrageous" - and now he's explained how he channeled those feelings.

Asked with Megadeth track he used most, Radcliffe tells Gigwise: "Sweating Bullets, specifically for the lines 'Hello me, it's me again / You can subdue but never tame me,' and 'A dark black past is my most valued possession.' It's an insane song and it sounds like a psychopath talking to himself - and that was very helpful."