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Najid Hanif (Chahak Patel)

Following Abby's kidnapping, Najid becomes the one member of the Family who will never give up on her, fighting to stay in the city and to continue searching. As he becomes more headstrong over the course of the series, will he ever be recognised as more than "just a kid"?

Sarah Boyer (Robyn Addison)

Self-serving and manipulative in the last series, Sarah is confronted with the horrors of the post-virus world in episode one of the new series, having to risk her life to rescue her friends. As Sarah deals with the repercussions of all this, she begins to find her place in the Family. Could she be finally headed for a happy ending?

Samantha Willis (Nikki Amuka–Bird)

The last surviving member of the British Government, Samantha Willis returns in the second series continuing her ambitious plans for expansion, aided and abetted by her henchman Dexter (Anthony Flanagan). As the number of compromises she makes grows, how much longer can her dreams of justice and fair governance last?

James Whitaker (Nicholas Gleaves)

Working with scientists Sami Masood (Ronny Jhutti) and Fiona Douglas (Geraldine Somerville), Whittaker continues to search for a vaccine. But how did they survive long enough to set up the Lab? What are their intentions for the other Survivors? And who are they making the vaccine for?

Michael Landrey (Patrick Malahide)

Landrey is a mysterious figure linked to the Lab.