Lucy Griffiths Lucy Griffiths

Lucy Griffiths is joining the cast of True Blood as a series regular in Season 5, has confirmed.

Griffiths will play Nora, another vampire sired by Godric, making her the vampire sister of Eric (Alexander Skarsgard). Nora is described as intelligent and intimidating, along with being a good liar, which serves her well as a double agent within the Vampire Authority. Though she loves Eric deeply, she's dedicated her life to a higher purpose.

Get more scoop on True Blood in our weekly spoiler column Mega Buzz

The 25-year-old British actress is best known for her role in BBC's Robin Hood. Additionally, Griffiths was the star of The CW's zombie pilot Awakening, which failed to get picked up.

True Blood is slated to return with Season 5 next year.