Andy Serkis has joked that he will look like Gollum in his later years.
The 48-year-old, who reprises his motion-capture role in Peter Jackson's The Hobbit, admitted that he was taken aback when he first saw a clay sculpture of his alter-ego.
"He is my Dorian Gray. When I saw the original sculpt of Gollum, he looks exactly like my father. It was very weird," he said.
He quipped: "I'm the only member of the cast who will grow to look like the character they play."
Andy - who stars in the three-part Lord Of The Rings prequel alongside Martin Freeman, Sir Ian McKellan and Cate Blanchett - said he had no qualms about returning to the role, almost 10 years on from The Return Of The King.
"I sort of knew for a long time that The Hobbit was in the offing. I've never returned to play a character before certainly not 10 years later," he said.
"The weird thing about coming back to it was not feeling like I own the character. When it's been out in the public consciousness to such degree like Gollum was, it's hard to reel him back in and feel like he is inside of me and not other people's impersonations of him."
He also admitted that playing Gollum challenges his body: "They're very physical roles and I have had lower back pain for some time, but you get through it by a physical regime. I do a lot of climbing and cycling when I'm working and I have a very good neuromuscular therapist."