Who knew they had it in them? Welcome to WatchMojo, and today were looking at established actors who delivered performances we never expected to see from them - going into the theater at least. Our countdown includes performances in movies Monster, The Substance, Philadelphia and more! What acting performance threw you for a loop? Let us know in the comments.

Check out these other actor centric videos:
Top 10 Actors Who Refused a Role for Surprising Reasons: https://youtu.be/SlVHl_ONOIU?sidE_mFkKvr9lh_jzf
Top 10 Actors Who Saved Their Careers With ONE SCENE: https://youtu.be/ypJfhyGFrUk?siAzsPRcxSrze87LXo
Top 30 Hated Actors: https://youtu.be/kdLU0kxFLx0?sigIL_YIHtiqyWGfZ6

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