Alina Andrei Alina Andrei is a stuntwoman and actress who portrayed a Sphere - Builder in the season 3 final episode . As a stunt actress , she received no credit for her appearance and the part where her character was electrocuted was cut out from the episode . Born in Brasov , Transylvania , Romania , Andrei immigrated into the United States in 1983 . Andrei studied acting under Barbara Benville and Doug Warhit and several stunt techniques under coaches such as Simon Rhee , Gene LeBell , Bob Yerkes , and Tad Griffith . She is skilled in martial arts , European , Italian , and Asian sword techniques , stunt fights and falls , and horseback riding and is also working as a sword fighting choreographer and instructor . Beside her work on - screen , Andrei is producing , writing , and creating projects , such as the award winning short film " La Fleur De La Bataille " , the television pilot " Omega 1 " , the direct to DVD series " Super Swordfighting Series " , and the action drama " The Spirit Within " . Among her performances in film and television are acting and stunt acting parts in the short science fiction horror thriller " Callous Sentiment " ( 2002 ) , the fantasy film " The Dream of Alvareen " ( 2004 , with Jenna Z . Wilson ) , the action short film " The Crusader " ( 2005 ) , for which she also choreographed the sword fights , the thriller " Stranger in the Doorway " ( 2005 ) , the television movie " Dead and Deader " ( 2006 , with John Billingsley , Armin Shimerman , Mark A . Altman , and Douglas Tait ) , and ' s science fiction film " Transformers " ( 2007 ) , as well as the television series " LAX " ( 2004 , with Bonita Friedericy ) , " Charmed " ( 2005 , with Jennifer Tung , David Figlioli , Scott Rinker , and Anthony Molinari ) , and " Justice " ( 2006 , with James MacDonald and Carlos Lacamara ) . Andrei served in several productions as stunt double for actresses , including Noa Tishby in " CSI : NY " ( 2005 ) , in " Charmed " ( 2006 ) , in the television thriller " Company Man " ( 2007 , alongside stuntmen Kevin Derr , Mike Gunther , Oliver Keller , Henry Kingi , Jr . , Paul Lacovara , Tim Sitarz , and Justin Sundquist ) , in three episodes of " Day Break " ( 2006 - 2007 , with stunts by Scott Workman and Boni Yanagisawa ) , in " NCIS " ( 2007 , under stunt coordinator Diamond Farnsworth ) , in " CSI : Miami " ( 2007 , along Hugh Aodh O ' Brien ) , in " Passions " ( 2007 ) , and for Jennifer Carpenter in several episodes of " Dexter " ( 2006 - 2007 , along Panuvat Anthony Nanakornpanom , Mark Munoz , Shawn Crowder , and Scott Leva ) . She also worked as motion capture performer for the video games " Golden Axe " ( 2007 ) , " Spider - Man : Web of Shadows " ( 2008 ) , and " Halo Wars " ( 2008 ) . More recently , Andrei appeared in the action film " Bare Knuckles " ( 2008 , with Bridgett Riley , Spice Williams - Crosby , Dana Dru Evenson , Erica Grace , Katie Rowe , and Boni Yanagisawa ) , the thriller " Stiletto " ( 2008 , under stunt coordination by Mark De Alessandro ) , the horror film " Live Evil " ( 2008 ) , episodes of " The Office " ( 2008 ) and " Knight Rider " ( 2008 , with Bruce Davison ) , and the comedy " 17 Again " ( 2009 , with Renee Taglia ) . She served as stunt double in two episodes of J . J . Abrams ' " Lost " ( 2008 ) , David Richard Ellis ' horror thriller " Asylum " ( 2008 , with Mark Rolston ) , an episode of " iCarly " ( 2008 , with Anthony De Longis and under stunt coordination of Vince Deadrick , Jr . ) , as stunt double for in " Desperate Housewives " ( 2008 , with Teri Hatcher , Brenda Strong , Kevin Rahm , and Arlo Hemphill ) , as double for in several episodes of " Criminal Minds " ( 2007 - 2008 ) , as double for in the comedy " Hard Breakers " ( 2008 , with Jeff Chase and stunts by Mark Riccardi ) , and as stunt double for in the thriller " A Perfect Getaway " ( 2009 , with Chris Hemsworth ) .