<P> Both themes intersect in the effort to control the creation of human life . Sarah, who matures because of her struggles, defends the bond between parent and child against the Neolutionists and Proletheans . </P> <Ul> <Li> Tatiana Maslany as Sarah Manning, Alison Hendrix, Cosima Niehaus, Helena, Rachel Duncan and several Project Leda clones (see below), all born in 1984 to various women by in vitro fertilization . </Li> <Li> Dylan Bruce as Paul Dierden, an ex-military mercenary, who is Beth's monitor and boyfriend . (seasons 1--4) </Li> <Li> Jordan Gavaris as Felix ("Fe") Dawkins, Sarah's foster brother and confidant . He identifies as a modern artist and moonlights as a prostitute . He is the first person Sarah confides in about the existence of clones . </Li> <Li> Kevin Hanchard as Detective Arthur "Art" Bell, Beth's police partner . </Li> <Li> Michael Mando as Victor "Vic" Schmidt, Sarah's abusive, drug - dealing ex-boyfriend . (main season 1, recurring season 2) </Li> <Li> Maria Doyle Kennedy as Siobhan Sadler, Sarah and Felix's Irish foster mother . They call her "Mrs. S ." She acts as guardian to Sarah's daughter Kira while Sarah is away . </Li> <Li> Évelyne Brochu as Dr. Delphine Cormier, Cosima's monitor, girlfriend, and fellow scientist . (recurring seasons 1, 4--5; main seasons 2--3) </Li> <Li> Ari Millen as Mark Rollins, a Prolethean; Ira, Susan Duncan's adopted son; and a number of other male Project Castor clones . (recurring season 2, main seasons 3--5) </Li> <Li> Kristian Bruun as Donnie Hendrix, Alison's husband and monitor . (recurring seasons 1--2, main seasons 3--5) </Li> <Li> Josh Vokey as Scott Smith, a fellow student of Cosima at the University of Minnesota, who later joins her and Delphine at the Dyad Institute . (recurring seasons 1--3, main seasons 4--5) </Li> </Ul> <Li> Tatiana Maslany as Sarah Manning, Alison Hendrix, Cosima Niehaus, Helena, Rachel Duncan and several Project Leda clones (see below), all born in 1984 to various women by in vitro fertilization . </Li> <Li> Dylan Bruce as Paul Dierden, an ex-military mercenary, who is Beth's monitor and boyfriend . (seasons 1--4) </Li>

Who plays all the clones on orphan black