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Miley is upset when she learns from Robbie that her identical cousin Luann is coming to visit. Luann goes to a Halloween party dressed as Hannah Montana planning to reveal Miley's secret. Lilly, Oliver, and Miley dressed as Hannah go to stop her before it's too late. Meanwhile, Robbie and Jackson compete with Mr. Dontzig to see who can have the scariest Halloween display.
At the end, when Dont'zig runs away from the 2 Robby Rays, he swipes the candy bowl. When the camera cuts to "Bobby" Ray and then back to both, the candy bowl is back on the table.