Fan Casting

The series begins with Sarah Manning, a British con artist residing in Toronto, witnessing the suicide of a woman, Beth Childs, who appears to be her doppelgänger. Sarah assumes Beth's identity and occupation (as a police detective) after Beth's death. During the first season, in episode 3, Sarah discovers that she is a clone, that she has many "sister" clones spread throughout North America and Europe that are all part of an illegal human cloning experiment, and that someone is plotting to kill them and her. Alongside her foster brother, Felix Dawkins, and two of her fellow clones, Alison Hendrix and Cosima Niehaus, Sarah discovers the origin of the clones: a scientific movement called Neolution. The movement believes that human beings can use scientific knowledge to direct their evolution as a species. The movement has an institutional base in the large, influential, and wealthy biotech corporation, the Dyad Institute, which is seemingly headed by Dr. Aldous Leekie. The Dyad Institute conducts basic research, lobbies political institutions, and promotes its eugenics program, aided by the clone Rachel Duncan. It also seeks to profit from the technology the clones embody and has thus placed "monitors" into the clones' personal lives, allegedly to study them scientifically but actually to keep them under surveillance.