As part of an initiation, the boys make Moose spend the night in the local haunted house and try to make him think the place is actually haunted. But when an actual ghost seems to appear in the house, Archie and Jughead go back to solve the mystery of who -- or what -- is behind these scary spooks.; Dilton unveils his greatest invention to date: Robby, a huge metal robot who can do anything, including communicate by beeping once for "yes" and twice for "no." But when Reggie loses Robby's control mechanism, the robot is free to do what he wants - and what he wants is to act like a typical teen-ager.; Jinx gives her father a choice of streets to walk down--the one with a candy store or the one with a toy store.; Jinx's father will buy her a present depending on how good she was that day.