She is in an abusive marriage and plans to kill her husband. This generates her number and Finch sends Reese to look into her. However Samaritan takes control of the city for 24 hours and sends Lambert to stop her from committing the crime. Lambert assures her that her husband would never hurt her again and shows her as Samaritan hacks her husband's insulin pump and kills him from insulin overdose.
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 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.
An employee in an IT company who tries to blow up the building. He is stopped before he could trigger the bomb because he had researched how to build a bomb manuals online, which alerted Samaritan. A bomb squad team arrives and arrests him just before Reese could intervene.