Fancy yourself as a bit of an actor encyclopedia? The stars on this list might just surprise you. If these guys prove anything, it's that even some of the most famous faces in the world can hide away behind a new acting mask. It takes considerable skill to wriggle away from the typecast-friendly attitude of the Hollywood industry, it takes boldness and bravery to take the risk in the first instance, and most importantly it takes commitment. Taking on a new face isn't just about the make-up artists earning their keep; it's about the performer truly throwing themselves into wildly new persona. Anyone can plonk a great wig on their head or whack on some glasses. But deceiving your biggest fans with an unrecognisable face and performance really takes some doing. These are the actors and actresses who made you doubt yourself, who made you do double-takes, and who eventually forced you into an IMDB check.They're stars who you thought you saw, claimed to see, then went back on your own word. They're the guys who made you lose that tenner to your friend that you're never getting back. These are the ten versatile Hollywood performers with more faces than a Rubik's cube.