Guest Stars Tom Beard as Bingham Ben Bailey Smith as Tyrone Jane Riley as Sam's Mother Maddy Griffiths as Young Sam Indira Varma as Natalie Thorpe David Sterne as Dave Ryder Uriel Emil as Hasan Moussa Aaron Neil as Rahim Soomro Trevor White as Patrik Lindberg Dermot Crowley as George Ballard Rob Heanley as MI6 Analyst Martin Wenner as Lars Holm Benjamin Smith as Slender Man Caroline O'Hara as Faroux's Aide Ged Simmons as Hotel Security Man Jamie Kenna as Security Man Jennifer Landor as Polly Holm