CHRIS Hemsworth got so big for 'Thor' he became a "freak".
The actor put on so much muscle for the titular role as the hammer carrying comic book hero, his own family struggled to recognise him, according to his younger brother, Liam.
He said: "Yup. He got big. He's a freak."
Liam is also an actor, and had to go the opposite way for his role as Gale in new film, futuristic sci-fi thriller 'The Hunger Games'.
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The 21-year-old star added: "Everyone's pretty hungry, so I wanted to look a little hungry. My brother said to me before I started shooting something about me putting on weight.
"Basically his point was that it was called 'Hunger Games', not 'Eating Games'. That was a wake-up call. I was like, 'Are you calling me fat or something?'"
Liam - boyfriend of singer Miley Cyrus - also said he identified with his character, friend to the story's protagonists, Katniss and Peeta, as soon as he read the script.
He told VanityFair.com: "It was always for Gale. I read the script, and Gale definitely felt more right than Peeta."
'The Hunger Games' is in cinemas from March 2012.