When a pair of teenage girls attack one another, each believing the other to be a monster, Mulder and Scully find that their investigation could possibly lead back to their long-lost son, William.
Quest roles:
William B. Davis(Cigarette Smoking Man), Keith Arbuthnot(Mr. Chuckleteeth), Miles Robbins(Jackson Van De Kamp / William), Louis Ferreira(Detective Costa), Francois Chau(Peter Wong), Cameron Forbes(Dr. Harris), Sunita Prasad(Dr. Aliyeh Scholz), Devon Alexander(Barista), Sarah Jeffery(Brianna Stapleton), Zak Santiago(Mr. Green), Ben Cotton(Mr. Paulsen), Madeleine Arthur(Sarah Turner)