Thor: the Dark World was originally intended to introduce a new character.
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In the comics, Balder the Brave is another brother to Thor Odinson.
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How he fit into the plot and the rest of the family is unknown.
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Concept artist Charlie Wen discussed his rejected designs for the character.
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"I never finished this because it wasn't really working for me," Wen said.
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Later, the MCU introduced Thor's half-sister Hela, rather than another brother.
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His original sibling, Loki, will soon star in his own TV show.
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Thor was last seen exploring space with the Guardians of the Galaxy.
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