In a parallel present where the latest must-have gadget for any busy family is a 'Synth' - a highly-developed robotic servant that's so similar to a real human it's transforming the way we live.

Katherine Parkinson
Laura Hawkins

Gemma Chan
Anita / Mia

Colin Morgan
Leo Elster

Tom Goodman-Hill
Joe Hawkins

Lucy Carless
Mattie Hawkins

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Killer Synth is the breaking news story, and public panic is growing. Karen is hot on Niska's tail, but are her motives for finding her more personal than professional?
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