- Cylon model instances: Shelley Godfrey
- Portrayed by: Tricia Helfer
Number Six is a family of fictional characters from the reimagined science fiction television series, Battlestar Galactica. She is portrayed by Canadian actress and model Tricia Helfer. Of the twelve known Cylon models, she is the sixth of the "Significant Seven". Like the others of the "Significant Seven", 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.
The character was named after Number Six, Patrick McGoohan's character from the show The Prisoner.
Six is a seductive, statuesque Cylon infiltrator. She was the first example shown of a new generation of Cylons capable of adapting to human form and emotions. Little else is known of her earlier years. She can, like other Cylons, retain memories which can be downloaded into another body if the original body is killed. Like her counterparts, her body was designed to mimic the human body at the cellular level, making her almost undetectable to testing procedures, and there are many copies of her in existence. Sixes and Eights are the Humanoid Cylon models shown most frequently. Sixes