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A con artist and thief, Sarah took on Beth Childs' identity upon witnessing Beth's death. It was originally as a scam to steal her life's savings but she then got drawn into the hidden conspiracy of illegal human cloning.

Sarah has a seven-year-old biological daughter, Kira; a foster brother, Felix; and a foster mother, Siobhan Sadler.

Street-smart and tough, Sarah at first wants no part of the other clones, only caring about getting together enough money to start over somewhere else with Kira and Felix, but discovers that she cares more about other people more than she thought.

Beth is Sarah’s entry point into the mystery. She is revealed backwards from the moment of her death, as Sarah takes on her identity and reconstructs her last days.

The reason for her suicide has yet to be revealed, but Sarah suspects that it was because she felt out of control of her life after discovering her nature as a clone. Before she stepped off the train platform, in a deliberate manner Beth removed, neatly folded, and set down her jacket, her high heels, and her handbag in an orderly row.

Beth who was a police detective, found out about the clones when Katja Obinger contacted her about the assassinations of clones in Europe; She then tracked down Alison and Cosima and they formed a group (the "clone club") for mutual protection. Paul, her live-in boyfriend, was Beth's 'monitor'.

A suburban woman whom Sarah calls a "soccer mom", she is married and has two adopted children.

She is the clone with whom Beth, then Sarah, is in the most direct physical contact, due to their geographical proximity.

Conservative, orderly and highly protective of her family, she is prone to emotional instability when taken out of her comfort zone.

Upon discovery that each clone is assigned a "monitor", she suspected both her husband, Donnie, and her neighbor and friend, Aynsley, of being her monitor.

Rachel is ruthless corporate efficiency personified. She’s a clone raised self-aware of her genetic identity, occupying an elite position with the Dyad group of companies that created the clones.

Rachel is known to get what she wants, and what she wants is Sarah and her daughter Kira – a biological goldmine – under Dyad control and, more importantly, under her heel.

But Rachel may have met her match in Sarah, who not only rivals Rachel’s will, but is entirely unpredictable.

Killed by Helena via a sniper rifle while meeting with Sarah as "Beth", she is the second clone Sarah encountered (Elizabeth being the first) and it was Katja's death that got her directly involved in the conspiracy.

Katja contacted Beth and told her about the existence of the clones and that their counterparts in Europe were being killed.

At the time of her death, Katja was suffering from a serious respiratory illness that made her cough blood; Cosima is trying to determine if this is a genetic risk to all the clones.

Helena is an assassin who is known to have killed Katja Obinger, and probably the other deceased clones, with the exception of Beth Childs.

She is a highly disturbed religious fanatic who has been manipulated to believe she is the "original" while the other clones are satanic doppelgängers, and that it is her duty to kill them all.

Mentally unstable, she self-mutilates by cutting. Her self-harm is focused on her back, and her cuts give the appearance of feathered angel wings. She and Sarah are twin sisters, both gestated by the same birth mother.

Aryanna (born in Rome, Italy) is one of the deceased clones from Europe.

Her documentation as well as hair and blood samples were contained in the briefcase Sarah had retrieved from Katja's hotel.

Danielle (born in Paris, France) is one of the deceased clones from Europe.

Her documentation as well as hair and blood samples were contained in the briefcase Sarah had retrieved from Katja's hotel.

Janika (born in Salzburg, Austria) is one of the deceased clones from Europe.

Her documentation as well as hair and blood samples were contained in the briefcase Sarah had retrieved from Katja's hotel.