In ‘The Whale’, Fraser plays the role of a 600-pound man who wants to reconnect with his teenage daughter.
Fraser has gained weight in recent years, but wearing a fat suit in Darren Aronofsky's film sparked discussions on the merits of wearing it in movies.
Opinions were divided between opponents who preferred hiring an overweight actor instead and supporters who said the movie could grab the Best Makeup Oscar.
The specifics of Fraser's transformation have yet to be revealed.
The first images of 'The Whale' were revealed as the film would premiere at the 79th Venice Film Festival in Italy.