Maisie Williams will play a teenage girl battling with an anonymous cyber-stalker in Channel 4’s new real-time thriller from the makers of Blackout.

Best known as Arya Stark in HBO’s Game of Thrones, Williams stars as Casey Jacobs, a teenager who experiences the worst the web has to offer – from peer-to-peer bullying to advanced computer hacking – and fights to overcome her ordeal.

Blackout, a feature-length ‘what-if’ drama looking at the effects of a cyber-attack on Britain’s national electricity grid, aired last year on Channel 4.

Cyber Bully‘s plot is inspired by dozens of real-life cases, with 69% of young people in the UK having experienced some form of cyber bullying.

Channel 4 Head of Documentaries, Nick Mirsky commented: “It is one of the most important purposes of Channel 4 to find new ways of engaging young audiences with the cyber world and the stories that play out on the internet. This film does exactly that in a way that is gripping, relevant and fiercely public service.”

Director Ben Chanan added: “The audience will be trapped with Casey for a full screen hour and we need an exceptional actress to play her. I couldn’t imagine anyone else in the role. Maisie Williams is not only remarkably talented, she also has an immediately likeable, feisty screen presence which makes you root for her instinctively.”

The cast also includes Ella Purnell (Maleficent) and Jake Davies (X + Y).

Cyber Bully will air on Channel 4 in early 2015.

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