The gang travels to Britain in 1843-ish and runs into Scrooge who claims he was attacked by the ghost of his partner Jacob Marley and that three more ghosts are coming. The gang agrees to solve the mystery but Velma wonders if she has more potential than just solving mysteries.
It's Christmas Eve and the gang is helping Scrooge find out who's behind the ghosts of Christmas past, present, and future, but Velma is also being targeted by the ghosts. Will Velma give in to the ghosts' demands and stop solving mysteries forever?—Knox