Idris Elba John Luther Actor, Associate Producer Ruth Wilson Alice Morgan Actor Warren Brown Justin Ripley Actor Dermot Crowley Justin Ripley Actor Nikki Amuka-Bird Erin Gray Actor Sienna Guillory Mary Day Actor Michael Smiley Benny Deadhead Actor David O'Hara George Stark Actor Elliot Cowan Tom Marwood Guest Star Georgina French Natalie Green Guest Star Simon Wilson Dr. Joe Green Guest Star Neil Cross Writer Phillippa Giles Executive Producer Leila Kirkpatrick Line Producer Katie Swinden Producer Farren Blackburn Director