Everyone helps put up Halloween decorations at Arnold's. Bag talks with Marsha about the Demons' plans. Ralph talks to Richie and Potsie about his annual Halloween party and asks Richie to visit the old Simpson house to check it out. Before taking Joanie to her Junior Chipmunk meeting, they stop at the Simpson house. Joanie is frightened by a fallen picture, and Richie opens a closet door and later tells Howard that he thought he saw a headless body. Marion takes Joanie (dressed as a werewolf) and her friends out to do some trick-or-treating. Richie dresses as a skeleton and goes to the party. A little cowboy and a fairy princess come to the door for candy. Richie and Gloria arrive at the Simpson house, see Ralph in a coffin, and then are greeted by everyone. Potsie bobs for apples, and Fonzie shows up with his date, Cloris. Potsie and Ralph set Richie up for a scare with a headless dummy in a closet. Bag and the Demons show up at the party uninvited and attempt to scare the gang. At the Cunningham house, Marion helps Joanie sort her candy.
Songs in this episode:
"I'm Walkin'" by Fats Domino (1957)
"Bird Dog" by The Everly Brothers (1958)
"Wake Up Little Susie" by The Everly Brothers (1957)
"Bye Bye Love" by The Everly Brothers (1957)
"My Prayer" by The Platters (1956)