Chris Hemsworth replaced his brother Liam as Marvel's Thor

Chris Hemsworth revealed, in an interview with Vanity Fair, that his younger brother Liam had made the final four in the casting of Thor, while Chris bombed the first audition.

The 32-year-old said: "I had an audition with Ken [Branagh, for 'Thor'] that didn't go very well. I remember walking out thinking, 'Oh well, there goes that opportunity.'

"Then one day Joss and Drew were reading the trades, and on the front was the final four for 'Thor.'

"And they pointed to Liam and said, 'Hey, is that your brother?' And I said, 'Yeah.' And they said, 'Why the hell aren't you in the mix?' And I said, 'I didn't get a callback.'

"And they were like, 'This is crazy.' And I was like, 'If one of us gets it, that's cool.' And they were like, 'No way. That should be you.'

"And when casting opened back up, Joss called Ken and said, 'Give Chris another shot.' "

During his second attempt at landing the film's lead, the hunk, who is known for his bulging biceps and ripped abs, remembers the crew commenting on his muscular physique.

He recalled: "They said, 'Umm, we're looking for a Thor-type, not actual Thor.' "

And despite his tough journey into the movie, Chris has admitted getting the role was a "dream scenario."

Poor Liam though.

Although, we doubt the 25-year-old, who landed the part of Gale Hawthorne in the Hunger Games franchise – which released its final installment last week – just months later was that disheartened.

Since Chris's muscular role in the Avengers series, he has ended at the other end of the spectrum for his latest role.

The actor withstood a gruelling diet of just 500 calories a day in preparation for his new movie In the Heart of the Sea.

To put that into perspective, a man of his physique is recommended to consume between 2,000 and 3,000 calories a day as part of a healthy lifestyle.

Chris, 32, who plays crew member Owen Chase, posted the pic on Instagram with the caption: "Just tried a new diet/training program called "Lost At Sea". Wouldn't recommend it.."

The film is based on an 1820 incident when a whaling crew were said to have been stranded at sea for 90 days after a sperm whale destroyed their ship - and which inspired Herman Melville’s novel Moby Dick.