Greer's boss at MI6 who's a double agent with the KGB. He sends Greer to kill Oleg Luski as he could expose his status as a double agent. Greer comes to learn the truth and kills Blackwood for betraying him.
A member of the Swat team that arrests Isaac before he could blow up the building he worked in.
A KGB double agent recruited by Blackwood, he worked undercover as an immigration attorney for a London firm. Fearing Luski could expose him, Blackwood sent Greer and his partner Jacob to kill him. Luski killed Jacob but was in turn wounded by Greer. After interrogating Luski Greer came to know of Blackwood's double agent status but allowed Luski to live telling him that his death would make no difference.
A woman seen arguing with her boyfriend in the street after Samaritan, in order to show its power, releases information that was never meant to be unearthed causing widespread chaos.