The Rise of Skywalker trailer ends with the chilling laugh of Emperor Palpatine.
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Director J. J. Abrams and actor Ian McDiarmid have both confirmed the Emperor's return.
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Instead of risking a leak, Lucasfilm decided to reveal the Emperor to generate buzz.
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The laugh does not show the Emperor, so fans can speculate about his return.
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Previously, Abrams faced criticism about the return of a major villain in Star Trek Into Darkness.
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Abrams lied and denied Khan's return... even though Benedict Cumberbatch WAS playing Khan.
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But with Palpatine confirmed to be back, the stakes are higher than ever.
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