Echo becomes an expert safe-cracker, and an invaluable piece of art is stolen from her on the engagement, forcing Sierra to take on a familiar persona. Agent Ballard gives Lubov an ultimatum, and Adelle confides shocking information to Topher.

Echo becomes the perfect wife for a lonely internet mogul, and Sierra's attacker is revealed. Meanwhile, Mellie's life is in danger and Agent Ballard's investigation takes a surprising turn when he comes face-to-face and goes fist-to-fist with Echo for the first very time.

When a traitor is discovered inside the Dollhouse, Echo and Sierra are programmed as spy hunters to uncover the culprit. Meanwhile, Ballard receives surprising news from Mellie, and Adelle harbors a secret.

When Adelle’s wealthy friend is murdered, Adelle imprints Echo with the woman’s memories and personality to solve the case. Ballard looks into Mellie’s past, and Topher secretly programs Sierra for an engagement.

Ballard’s investigation leads him to the agoraphobic designer of the Dollhouse (guest star Alan Tudyk), and the story of “Sleeping Beauty” foreshadows Echo’s future, while allowing her to help a young girl deal with her traumatic past. Adelle goes to the attic in search of answers, while Alpha reveals himself and sets his game in motion.

It has been several months since Alpha's reign of terror and Echo, who is now randomly picking up flashes of past engagements, weds a British businessman who has ties to one of Ballard's open FBI cases. Topher becomes the target of Dr. Saunder's aggression after she finds out that she is actually a doll named Whiskey. Boyd takes on a risky venture and mixes business with pleasure, while DeWitt makes Ballard an irresistible offer.

Echo and Victor’s imprints collide when Echo is sent on an assignment as a fun-loving, seductive college student and Victor is imprinted as the psychotic nephew of a Dollhouse shareholder.

After her entanglements with Senator Perrin and the DC Dollhouse, Echo finds herself out in the world-at-large as she struggles to control her multiple memory downloads. Topher discovers the dangers of science that will have devastating effects on the future, while Adelle engages in a power struggle with Harding.

As his contract with the Dollhouse expires, Victor is released back into the world, where his military past threatens his future with Sierra. Meanwhile, Echo is deemed too dangerous and is sent into her worst nightmare.

When Adelle, Boyd, and the rest of the Dollhouse fear that Echo's uncontrollable mind imprints are making her a danger to their goals, they send her to "the Attic" where Echo is forced to face her worst nightmare in order to survive.

Topher races to reconstruct Echo's original personality and memories when Adelle realizes they are the key to averting a devastating future. Meanwhile, Echo and Bennett's shared past and the identity of The Rossum Corporation's mysterious leader are revealed.