Tricia Janine Helfer (born April 11, 1974) is a Canadian model, actress and science-fiction mainstay. She is perhaps best-known for her role as humanoid Cylon Number Six on Ronald D. Moore's re-imagined Battlestar Galactica (2003), for which she garnered critical acclaim and achieved status as a science-fiction icon.
- Contralto of Danger: Her deep, husky voice has served her well as Action Girls, both light and dark.
- Ms. Fanservice: Helfer is a model as well as an actress, and is absolutely gorgeous. As a result she's been cast as Ms. Fanservice in just about everything from Battlestar Galactica (2003) to Chuck. It might be easier to say what she isn't Ms. Fanservice in. She's also this in real life largely by virtue of existing.
- Statuesque Stunner: She's 5'10 and tends to tower over her co-stars.
- 2006 Memory as Stephanie Jacobs
- 2007 Spiral as Sasha
- 2009 Green Lantern: First Flight as Boodikka
- 2011 Bloodwork as Dr. Wilcox
- 2003-2012 Battlestar Galactica (2003) as Number Six
- 2007-2009 Burn Notice as Carla
- 2008-2009 The Spectacular Spider-Man as Felicia Hardy/Black Cat
- 2009 Chuck as Alex Forrest
- 2009 Warehouse 13 as Bonnie Belski
- 2009-2011 Two and a Half Men as Gail
- 2010 Dark Blue as Alex Rice
- 2012 Criminal Minds as Izzy Rogers
- 2012 Husbands as Pillow Girl #2
- 2012-2013 TRON: Uprising as Grid
- 2013 Community as Lauren
- 2014 Killer Women as Molly Parker
- 2014 Ascension as Viondra Denniger
- 2016 Lucifer as Lucifer's Mother, "the Queen of Creation"/Charlotte Richards
- 2007 Command And Conquer 3 Tiberium Wars as Kilian Qatar
- 2008 Spider-Man: Web of Shadows as Felicia Hardy/Black Cat
- 2009 Halo 3: ODST as Captain Veronica Dare
- 2010 Mass Effect 2 as EDI
- 2010 StarCraft II: Wings of Liberty as Sarah Kerrigan
- 2012 Mass Effect 3 as EDI
- 2013 StarCraft II: Heart of the Swarm as Sarah Kerrigan
- 2013 Marvel Heroes as Black Cat
- 2015 Mortal Kombat X as Sonya Blade
- 2015 Starcraft II Legacy Of The Void as Sarah Kerrigan