Characters played by Adam Brown
John
Characters played by Sarah Greene
Margaret
Characters played by Grahame Fox
Commissioner
Characters played by Miles Roughley
Young John
Characters played by Jerome St. John Blake
Doctor Hart
Characters played by Richard Henders
Samuel Fitzgerald 'Sam' Collins
Characters played by Rachel Al-Habib
Nurse Evelyn Gwyneth Jones
Characters played by Amber Doyle
Science Officer Robin Carter-Lloyd
Characters played by Simon Sparks
Escaping Patient
Characters played by Chris Beard
Supporting Cast
Characters played by Georgia Breedon
Supporting Cast
Characters played by Kate Budge
Supporting Cast
Characters played by Claire Duncan
Supporting Cast
Characters played by Mike Fordham
Supporting Cast
Characters played by John Gomez
Supporting Cast
Characters played by Sharon Harris
Supporting Cast
Characters played by Love Hobbs
Supporting Cast
Characters played by Jamie Hull
Supporting Cast
Characters played by Jane Irons
Supporting Cast
Characters played by Jefferson King
Supporting Cast
Characters played by John Lacey
Supporting Cast
Characters played by Ross Lanham
Supporting Cast
Characters played by Abbie Leek
Supporting Cast
Characters played by Daniel O'Keefe
Supporting Cast
Characters played by John O'Reilly
Supporting Cast
Characters played by Adam Scarborough
Supporting Cast
Characters played by Marc Skinner
Supporting Cast
Characters played by Stephanie Thorpe
Supporting Cast
Characters played by Dan Twine
Supporting Cast
Characters played by Robert Williams
Supporting Cast
Characters played by Rebeccah Plenderleith
Additional Voices
Characters played by Max Plenderleith
Additional Voices
Characters played by Laura Rice
Additional Voices
Characters played by Dru Wakely
Additional Voices
Characters played by Jefferson King
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