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As Anita explains to Laura that she was created as Mia to look after Leo the pair start to bond. Karen tracks down Niska, revealing that Dr Elster created her in his wife's image but Leo rejected her as a mother and she was presumed 'dead'. She opposes the Synths' plan and draws a gun, accidentally killing George. Niska escapes to the Hawkins' house, where she is joined by Fred, Max and Leo - along with a bewildered Joe, who is persuaded by his family to shelter the fugitives. Unfortunately Karen turns up on the door-step, accompanied by Hobb and a squad of armed police.
- Stars: Adam Astill , Alicia Woodhouse , Caroline Lee-Johnson , Colin Morgan , Danny Webb , Dominic Mafham , Ellen Thomas , Emily Berrington , Gemma Chan , Ivanno Jeremiah , Jack Derges , Jill Halfpenny , Jonathan Aris , Joshua Hill , Joshua Johnson , Katherine Parkinson , Lucy Carless , Luke Mordue , Manpreet Bachu , Matt Sapsford , Neil Maskell , Neil McKinven , Nigel Boyle , Nikolaos Brahimllari , Paul Blackwell , Paul Kaye , Pixie Davies , Rebecca Front , Ruth Bradley , Sope Dirisu , Sophie Gooding , Sophie Slavin , Spencer Norways , Stella Gonet , Stephen Boxer , Theo Stevenson , Tom Bell , Tom Goodman-Hill , Tor Clark , Tyana Perez , Will Tudor , William Hurt