This myth was promoted by the Egyptologist Margaret Murray in the early 20th century and was then debunked by the historian C. L'Estrange Ewen almost as soon as it appeared. It was founded on a ...
Earlier in the season, Billy (Joe Locke), known then only as a "mysterious teen," had pleaded with Agatha to accompany him on that journey. In Episode 5, his true identity is revealed as Wanda's son.