This Halloween, it's not ghosts or goblins that are frightening Miley, but her "treat" of a cousin, Luann. Apparently, Luann, who could pass for Miley's twin, is really a "trickster" and try as she might, Miley cannot get anyone to believe that Luann is out to get her. As Luann aims to expose Miley's and Hannah's secret, will Miley be able to stop her dubious doppelganger in time? Jackson and Robbie give the phrase "Anything you can do, I can do better" a new meaning when they keep trying to top Mr. Dontzig's ghoulish decorations.

Amber and Ashley are up to their old tricks again, only this time Miley and Lilly devise a plan to give one of the girls a taste of her own medicine. A persnickety pooch named Oscar drives Robby and Jackson batty with its constant barking.

The Stewarts' nasty neighbor gets Miley and Jackson to look after his equally nasty niece. Robby gets the flu and Roxy has to look after him.

Miley agrees to go out with a charming boy named Connor for the holidays. Connor's elfin stature and his job helping Santa at the mall, however, clashes with her idea of the perfect guy. The neighborhood Scrooge, Mr. Dontzig, offers to get Jackson into the college of his dreams, but only if Jackson and Robby do everything that he asks of them.