In 2009, Whedon created his fourth television series "Dollhouse", and explored themes throughout the show that were initially present in an unproduced spec script of his called "Afterlife". The series follows Echo, whose brain is programmed to accomplish various assignments, on her journey towards self-awareness. As stated by Whedon, "Dollhouse" was about "the sides of us that we don't want people to see", sexuality and, on some level, a celebration of perversion, which he equates to obsession, "the thing that makes people passionate and interesting and worthy".