Who did appear in Jacob's cabin in "The Man Behind the Curtain"? (poll 2842399)

Who did appear in Jacob's cabin in "The Man Behind the Curtain"?

Jacob, who is actually able to shapeshift

Jacob, played by another actor only because the definitive actor hadn't been cast yet

MIB, appearing as an unknown person

Someone else

There was nobody, it was just a production error

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