Echo is a fictional character portrayed by Eliza Dushku in the Fox science fiction series Dollhouse, created by Joss Whedon. Within the series' narrative, Echo is an "Active" or a "doll", one of a group of men and women who can be programmed with memories and skills to engage in particular assignments; in their default state, Actives are innocent, childlike and suggestible. Before having her memories wiped, Echo's name was Caroline Farrell. The central character of Dollhouse, the series focuses on Echo as she begins to develop self-awareness. By the series' conclusion, Echo develops a fully formed self, personality, and the aggregate skills and abilities of all her many personalities, which she uses in her struggle against the evil Rossum Corporation which owns the Dollhouses and plots wor