Katrina Law has joined the cast of The CW's hit DC Comics series Arrow. She will be portraying Nyssa al Ghul, the daughter of Ra's al Ghul and half-sister of Talia.

Nyssa al Ghul is a powerful member of the League of Assassins, who heads to Starling City in pursuit of The Canary (Caity Lotz).

The upcoming season will be substantially expanding, bringing on numerous iconic DC comic book characters to the series. The long list includes Caity Lotz as Black Canary, Summer Glau as Isabel Rochev, Michael Jai White as Bronze Tiger, Kevin Alejandro as Sebastian Blood, Bex Taylor-Klaus as Sin, Grant Gustin as Barry Allen (aka The Flash) and Dylan Neal as Dr. Anthony Ivo.

Katrina Law is best known for her role as Mira in Spartacus. It is not known when she will maker her debut. Arrow airs Wednesdays at 8/7c on The CW.