DOLLHOUSE: Sierra's (Dichen Lachman, R) past and how she came to the Dollhouse is revealed in the DOLLHOUSE episode "Belonging" airing Friday, Oct. 23 (9:00-10:00 PM ET/PT) on FOX. Also pictured: Eliza Dushku (L). ©2009 Fox Broadcasting Co. Cr: Adam Taylor/FOX

Beginning today, DOLLHOUSE fans can have ECHO (Eliza Dushku) come alive on their computer desktops with “Virtual Echo,” a new application based on the fan-favorite series that airs Fridays (9:00-10:00 PM ET/PT) on FOX. “Virtual Echo,” a new free augmented-reality desktop application built by integrated marketing agency BLITZ using the Adobe® Flash® Platform, is available for download only at www.fox.com/virtualecho . Powered by Adobe® AIR®, “Virtual Echo” brings the DOLLHOUSE’s most-requested Active to life on computers in two unique ways: