The CW’s Arrow has targeted an actress with out-of-this-world sci-fi credentials to fill the key role of Talia al Ghul.

TVLine has learned that Lexa Doig — whose TV credits include but are not limited to Andromeda, Continuum, Stargate SG-1 and The 4400 — has been cast in the recurring role of Talia, another daughter of Ra’s al Ghul and half-sister of Nyssa. Described as worldly and cultured, Talia is “an elite warrior who doesn’t pick sides but rather creates her own.”

Doig’s TV credits also include Sky1’s CI5: The New Professionals, Canada’s Saving Hope and Traders, plus episodes of Supernatural, Eureka, Smallville and Primeval.

Arrow continues Season 5 tonight at 8/7c, with Episode 5; Doig will first appear in Episode 10.

Want more scoop on Arrow, or for any other show? Email insideline@tvline.com and your question may be answered via Matt’s Inside Line.