End of Show, a TV website, announced that the unaired 13th episode of Dollhouse, "Epitath One" will be shown during Comic-Con ’09 in San Diego this July. This is part of the special release of the DVD box set for the first season of the show. It will be available a week before the regular release. The episode is directed by creator Joss Whedon and written by Maurissa Tancharoen and his brother Jed, who also wrote "Stage Fright".
Also, there are spoilers in this article, but we can say Felicia Day plays a major part in this episode.