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The Wicked Witch (Margaret Hamilton), The Wizard of Oz
The Wicked Witch of the West, played to career-defining effect by Margaret Hamilton, is such a memorable character that she's gotten her own "spin-offs," including the book/Broadway show Wicked. Her slime-green skin and "I'll get you, my pretty" screech are still terrifying kids (and adults) nearly 75 years after the film debuted. Fortunately, all it took was a little water for the people of Oz to rejoice, "Ding, dong, the witch is dead!"