Tricia Helfer as Number Six: Battlestar Galactica

Battlestar Galactica

Six is a seductive, statuesque Cylon infiltrator. She is portrayed by Canadian actress and model Tricia Helfer

Tricia Helfer 

is best known for playing the humanoid Cylon Number Six in Ronald D. Moore's re-imagined Battlestar Galactica television series (2004–2009).

"Number Six" 

is a humanoid Cylon who plays several key roles in Cylon society. She is the first humanoid Cylon that viewers witness in the re-imagined Battlestar Galactica. Stunningly beautiful and highly religious, there are several versions of her, including Caprica-Six, Shelly Godfrey, Gina Inviere, Natalie Faust, Lida and Sonja. She is the only model that does not use one particular human alias for all copies.