
Hodor has been a mainstay of "Game of Thrones" for most of its run, and in this week's episode we finally learned how he got his name.
(Warning: Hodorable fan-made door stops inspired by show spoilers ahead...)

Bran visited the past and warged into a young Hodor, known then as Wyllis...
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The magical possession caused Wyllis' mind to break...
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Wyllis could hear Meera in the present screaming "Hold the door!"
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Wyllis repeated the phrase over and over until it was condensed to "Hodor."
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Hodor.