Top Model so she could concentrate on Battlestar Galactica. Helfer also played a major role in Electronic Arts Command & Conquer 3: Tiberium Wars, as the high-level Nod general Kilian Qatar, along with her Battlestar Galactica co-star, actress Grace Park. She also starred in the episode "Roadkill" on the second season of Supernatural. Helfer had a recurring role on CBS' Two and a Half Men. She played Gail, best friend of Charlie's (Charlie Sheen) fiancée Chelsea (Jennifer Taylor). When Chelsea finds out that her friend is recovering from a breakup, she says she should do so at Charlie's house. Shortly after Chelsea and Charlie begin a trial separation, Gail begins a sexual relationship with Charlie. Battlestar Galactica In 2003, the television series Battlestar Galactica was used as the basis for a three-hour miniseries on the Sci Fi channel. The project was written and produced by Ronald D. Moore and directed by Michael Rymer. Helfer played the role of Number Six, a humanoid Cylon operative. She continued that role as a regular cast member in the TV series, which completed its fourth and final season on March 20, 2009. Due to the special nature of the Number Six character – there are many "copies" of Number Six with distinct personalities – Helfer has, in effect, played numerous roles on the series. In 2009, she reprised her role as Number Six in Battlestar Galactica: The Plan – a television movie that tells the story of the series from the Cylons' point of view. In 2012, she voiced a prototype Cylon in the prequel Battlestar Galactica: Blood & Chrome. Awards: Leo Awards, Best Lead Performance By A Female in a Dramatic Series, Tricia Helfer ("Pegasus") Nominations: Scream Awards, Breakout Performance, Tricia Helfer as Number Six Scream Awards, Best Television Actress, Tricia Helfer 2008–present In August 2008, Helfer appeared on the stage of NVISION 08, an event sponsored by NVIDIA, where she discussed her role in Battlestar Galactica as well as the use of computer graphics on the show. Helfer appeared in an episode of the NBC series Chuck, and as Michael Westen's nemesis in the USA Network series Burn Notice as "Carla Baxter". She appears as herself in Old 97's music video for their song, "Dance with Me". She guest starred in "Resonance", the second episode of Warehouse 13 as FBI Agent Bonnie Belski on Syfy. She made a guest appearance in the