 Two episodes before this and after "Slim City" were skipped. The  first one advanced the plot slightly, explaining how Luna became  Serenas new pet. However, Sammy is afraid of cats. The episode was  skipped because Sammy kicked Luna. Luna also tossed a cute animal  over a fence (though the animal was evil). The second episode was  skipped because Serena used the Luna Pen to turn into an adult,  where she resembles a prostitute. She also used her new look to  sneak into a bar, where she ordered a root beer not to mention  getting in the car with a man, she just met.