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As protesters march against the increased use of domestic Synths Hobb prepares to experiment on the brains of his captives in his efforts to crack the secret of artificial intelligence. Now fully sympathetic to Anita/Mia and the others as sentient creatures the Hawkins family, assisted by Pete Drummond, threaten to expose Hobb's experiment to the press unless he releases the Synths - which he does though with a tracking device inside Fred. On the run the family and the Synths mingle with the protesters before taking refuge in a church crypt. Here Leo takes a gamble on Karen's loyalty to her kind in order to ensure their future survival.
- 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