Dark Horse Presents has released an all new free online comic based in Joss Whedon’s Dr. Horrible universe. The one shot is a prequel to the webseries and focuses on Penny (Felicia Day’s character). The issue was written by Zack Whedon with artwork by Jim Rugg. You can check it out by heading here. Previously, Zack wrote an online one shot focusing on Captain Hammer (click here for details on that issue).