Playing real-life serial killer, Aileen Wuornos in the 2003 film, 'Monster' won Charlize Theron a Best Actress Oscar. AP Photo, Courtesy Newmarket Films
British star, Christian Bale transformed into former US vice president, Dick Cheney for 2018's 'Vice'. Getty Images / Annapurna Pictures
Irish actor, Colin Farrell is unrecognisable as Oswald Cobblepot AKA The Penguin in 'The Batman', due for release in 2022. Getty Images, Warner Bros
Scottish star, Ewan McGregor aged a few years and saw his hairline recede for his role as Emmit Stussy in Netflix's 'Fargo'. Getty Images, Netflix
Tom Cruise shocked and wowed fans when he transformed into foul-mouthed studio head, Len Grossman, in 2008's hilarious 'Tropic Thunder'. AP Photo, Paramount Pictures
British actress Tilda Swinton showed her versatility by playing a man in 2018 film, 'Suspiria'. EPA, K Period Media
Rooney Mara was unrecognisable as computer hacker, Lisbeth Salander in 2011 film, 'The Girl with the Dragon Tattoo'. Getty Images, Nordisk Film
Oscar-winner Matt Damon went on a weight gain diet to play the hapless Mark Whitacre in 2009's 'The Informant'. Getty Images, IMDB
American actor, Jared Leto piled on the weight to play John Lennon's killer, Mark David Chapman in 2007's 'Chapter 27'. Reuters, Photofest
Gary Oldman won a Best Actor Oscar for portraying Winston Churchill in 2017's 'Darkest Hour'. Reuters, Courtesy Focus Features
Playing real-life serial killer, Aileen Wuornos in the 2003 film, 'Monster' won Charlize Theron a Best Actress Oscar. AP Photo, Courtesy Newmarket Films
British star, Christian Bale transformed into former US vice president, Dick Cheney for 2018's 'Vice'. Getty Images / Annapurna Pictures
Irish actor, Colin Farrell is unrecognisable as Oswald Cobblepot AKA The Penguin in 'The Batman', due for release in 2022. Getty Images, Warner Bros
Scottish star, Ewan McGregor aged a few years and saw his hairline recede for his role as Emmit Stussy in Netflix's 'Fargo'. Getty Images, Netflix
Tom Cruise shocked and wowed fans when he transformed into foul-mouthed studio head, Len Grossman, in 2008's hilarious 'Tropic Thunder'. AP Photo, Paramount Pictures
British actress Tilda Swinton showed her versatility by playing a man in 2018 film, 'Suspiria'. EPA, K Period Media
Rooney Mara was unrecognisable as computer hacker, Lisbeth Salander in 2011 film, 'The Girl with the Dragon Tattoo'. Getty Images, Nordisk Film
Oscar-winner Matt Damon went on a weight gain diet to play the hapless Mark Whitacre in 2009's 'The Informant'. Getty Images, IMDB
American actor, Jared Leto piled on the weight to play John Lennon's killer, Mark David Chapman in 2007's 'Chapter 27'. Reuters, Photofest
Gary Oldman won a Best Actor Oscar for portraying Winston Churchill in 2017's 'Darkest Hour'. Reuters, Courtesy Focus Features
Playing real-life serial killer, Aileen Wuornos in the 2003 film, 'Monster' won Charlize Theron a Best Actress Oscar. AP Photo, Courtesy Newmarket Films