Rhona Mitra

as Ava Stone

as Betty

as Petra

as Selina

as Rachel Donnelly

as Self - Narrator

as Martha

as Dr. Mal

as Simone

as Amanda Chadwick

as Erma

as Sofia

as Mercy Graves (4 episodes)

as Allison Vanowen

as Charlotte (4 episodes)

as Dr. Rachel Scott (23 episodes)

as Cameron Grainger

as Andie Rubin

as Claire Radcliff (13 episodes)

as Maj. Rachel Dalton (20 episodes)

as Barbara

as Commander Kiva (3 episodes)

as Katrien Becker

as Sonja