xie Davies as Sophie Hawkins, Laura and Joe's younger daughter. She names the new family synth Anita after a friend of hers who has moved away, and develops a strong affection for the synth.
Tom Goodman-Hill[1] as Joseph "Joe" Hawkins, Laura's husband. He bought Anita because he felt Laura's absence caused a void, and he needed help managing their family.
Jill Halfpenny[5] as Jill Drummond, Pete's disabled wife. She is dissatisfied with Pete.
Neil Maskell[2] as D.S. Pete Drummond, an unhappy Special Technologies Task Force officer who has always been suspicious of synths. He is partnered with D.S. Karen Voss.
Colin Morgan[1] as Leo Elster, son of David Elster, a part-synth fugitive believed by the rest of the world to have died in a car accident.
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She is violent and resentful of humans and wishes to live her own life, but later starts to care for humans.
Ruth Bradley[5] as D.S. Karen Voss, police partner of D.S. Pete Drummond. Unbeknownst to those around her, she is a conscious synth and was created by David Elster to replace his late-wife, Beatrice. Karen wants to die, but her programming forbids suicide.
Gemma Chan[1] as Anita/Mia, a servile synth belonging to the Hawkins family. She was sold as new, but is actually Mia, a conscious synth built by David Elster to be Leo's babysitter, kidnapped and hacked with new software.
Jack Derges[5] as Simon, Jill Drummond's attractive synth caregiver and physiotherapist. Pete is dissatisfied with Simon, thinking that he is his replacement.
Sope Dirisu[2] as Fred, a conscious synth built by David Elster to be a brother to Leo. Professor Hobb likens Fred to the Mona Lisa.
Rebecca Front[1] as Vera, a tight-smiled medical synth from the NHS who is supposed to replace Odi as George Millican's caregiver; Millican is frustrated with her relentlessly officious and domineering manner, and generally refuses her
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Upon her return, wife Laura feels displaced and cast off. She also complains that this will confuse the children, especially after the youngest child, Sophie, names the robot Anita after her friend who moved away. In a flashback, a group including Leo, Max, Niska, and Anita were hiding out in the forest five weeks earlier; everyone except Max and Leo were abducted and taken away into London. Fred, Leo and Max's contact in London, is concealing a mobile phone, which is blatantly outside allowed behaviour for a synth, and taken in for investigation by Hobb, who suspects him to be "something much more special" than the average synth. George's outdated synth Odi malfunctions while shopping and injures a female shop assistant. Back at the Hawkins' residence, Anita carries the sleeping Sophie out of the house one