Unbelievable Actor Transformations For Their Roles

Chris Pratt bulked up for his superhero role in this 2014 summer blockbuster

Matthew McConaughey drastically slimmed down for his role as an AIDS victim

Hathaway cut her hair and lost 25 lbs off her already slim figure for the role of Fantine

Theron gained weight, thinned and fried her hair, and used make up to get her skin blotchy for her role

Zellwegger gained 25 lbs for her role as Bridget Jones

Slender starlet Natalie Portman became worryingly thin and dropped 20 pounds to portray a ballerina

Christian Bale's weight definitely transformed from hero to zero for this film

Leto starved himself for a month to play an HIV+ trans woman in this movie

Tom Hanks grew out his hair and lost weight over the course of filming for Castaway

Mila Kunis' weight dipped below 100 after she dropped 20 lbs for Black Swan

Matthew Fox slimmed down to just muscle for his role as Alex Cross

Pitt gained over 25 lbs of pure muscle to play the mega hot Achilles

Rooney Mara bleached her brows, dyed and cut her hair, and lost weight for this extreme and demanding role

Matt Damon binged on junk food to gain 30 lbs for his role

Swank completely changes her look to portray transboy Brandon in this film.