Jughead's cousin Jake and his friend Hank play a trick on Archie and Jughead, causing them to believe that museum displays are coming to life at night.
Archie and the gang are getting ready for a costume party at the school. Betty and Veronica are being spied on by someone as they prepare their costumes. At the party, someone dressed as a seawitch is making trouble for Archie, Betty and Veronica.