Season 3 of The Following will feature an appearance from Smallville alum Allison Mack, reports Entertainment Weekly. Allison Mack as Chloe Sullivan in Smallville Mack will play Hillary, described by EW as, "a naïve, small town police officer caught up in Ryan Hardy’s (Kevin Bacon) hunt for a serial killer." Mack's guest appearance will reunite her with Shawn Ashmore, who guest starred on Smallville twice - before his twin brother, Aaron Ashmore, joined the series as Jimmy Olsen. Continue reading…