Polly Walker Cast in SANCTUARY Season 3 July 26, 2010 News, Sanctuary Actress Polly Walker will be making a guest appearance on the upcoming season of “Sanctuary.” Walker will appear in two episodes during the next season of the SyFy network series. Walker will play the role of Ranna, a strong adversary who faces off against Helen Magnus who is played by Amanda Tapping. Walker’s character will first appear during the series’ midseason cliffhanger, after which Magnus’ team encounters Ranna. Walker is well known for her roles on the HBO series “Rome” and SyFy’s own series “Caprica.” Representatives from the network confirmed that Walker’s guest appearance on “Sanctuary” will not interfere with her responsibilities on “Caprica.” (Source: THR) Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on Reddit (Opens in new window)Click to share on Google+ (Opens in new window)Click to share on Tumblr (Opens in new window)Click to share on Pocket (Opens in new window)