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Official Site: 20th Century Fox

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.

Caroline Farrell is revealed to have been a student at a Los Angeles university which hosted a research lab for the Rossum Corporation. Feeling called to expose the likely animal abuses carried on in the highly secretive laboratory, she and her boyfriend Leo snuck into the lab with cameras through underground piping and discovered not only encaged animals but also evidence of tampering with infants and the human brain. She and Leo were caught in the act, and Leo was apparently fatally wounded. Knowing Caroline knew too much about the Corporation (whose research created the Dollhouse), and knowing that she was heartbroken over the death of Leo, Adelle DeWitt was contacted to recruit Caroline, but she disappears before the offer could be made.

Caroline became determined to take Rossum down, going so far as to sneak into Adelle's offices at the Los Angeles Dollhouse and steal confidential files on herself and Bennett Halverson. She then sought out Bennett at Arizona Technical Institute to use for access to Rossum's facilities, and the two became friends. Bennett later discovered Caroline's ruse, and offered her assistance in destroying the Rossum facility. Caroline and Bennett sneaked into the lab, and rigged explosives in the building; however, Caroline discovered that there were human test subjects in a secret room and tried to abort the plan to save their lives. It was too late, however; the explosives went off, and a pylon fell on Bennett, crushing her arm and pinning her to the floor. Caroline discovered that Adelle, Dominic, and several guards had entered the building, and that there was no time to get Bennett and herself safely out. She told Bennett to lie about her complicity in the bombing to keep from being punished by Rossum, and fled. Adelle and Dominic caught her in the corridor, and sent her alone to meet the head of Rossum, revealed to be Boyd Langton.

An undisclosed amount of time later, in the first scene of the first episode, a haggard-looking Caroline is seen in Adelle's office, begrudgingly agreeing to the terms of her sentence as an Active.

Echo (Dollhouse) has not been a contender in any CBUB matches.