Number Three
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D'anna Biers is a Colonial reporter who appears in the episode "The Farm".
She is apparently one of two Humano-Cylons to be revealed in Season 2 (2005-06); and may be one of the eight agents Sharon Valerii revealed to be onboard the Galactica.
Biers is portrayed by actress Lucy Lawless. [1]
Notes
The Internet Movie Database has Lawless listed as appearing in episodes "Home, Part I" and "Home, Part II", however this has not been officially confirmed yet.