Star Wars Cast Didn't Know About 'I Am Your Father' Scene Until Movie Was Out

Mark Hamill said it was "agony" to keep that plot twist a secret from his costars for over a year

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J.J. Abrams reveals Obi-Wan and Yoda are secretly in 'Star Wars: The Force Awakens

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Defining Moments: I Am Your Father • Lucasfilm

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Star Wars: Episode V - I am your Father

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The 50 Worst Decisions in Movie History

In The Empire Strikes Back (1980) ending, the original script had Vader telling Luke: Obi-Wan killed your father. This was to ensure that the reveal was kept secret from the entire cast.