Benedict Cumberbatch is set to voice the dragon Smaug in The Hobbit.
The Sherlock Holmes star, who will also lend his vocal talents to the character of Necromancer, will portray the creature via motion capture in Peter Jackson's Lord Of The Rings prequel, reported Deadline.
Benedict had previously confirmed he had landed a part in the big-screen adaptation of JRR Tolkien's novel, but couldn't reveal details.
Welsh actor Luke Evans would be playing skilled archer Bard the Grim, also known as Bard the bowman, in the two-part film, who single-handedly takes on the dragon.
Benedict, fresh from his dual performance in Danny Boyle's stage production of Frankenstein, has supporting roles in Steven Spielberg's War Horse and Tinker Tailor Soldier Spy opposite Gary Oldman, Tom Hardy and Colin Firth.
He is also starring in the five-part TV mini series Parade's End with Rebecca Hall.