Most dramatic actor transformations

Published On: Oct 16 2012 02:53:40 PM CDT   Updated On: Jan 23 2014 08:57:57 AM CST

Matthew McConaughey and Jared Leto are receiving buzz during awards season for their dramatic transformations in "Dallas Buyers Club." Take a look at some of the other most dramatic actor transformations ever seen on film.

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Warner Bros. Pictures

Clooney gained more than 30 pounds and grew a graying beard in hopes that audiences wouldn't instantly recognize him playing pudgy CIA operative Bob Barnes in 2005's "Syriana," a role that won him an Academy Award for Best Supporting Actor.

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