Sheck

Sheck was a member of Helix and Cayden James's right-hand man.

Biography
Sheck met with Black Siren to give her the next target that she needed to kill and obtain fingerprints from in order for the group to access the International Domain Name Directory vault. He was with James and Black Siren when they came across Alena and Felicity Smoak, who had broken into the abandoned Helix hideout, and escaped with them when Team Arrow interfered. Later, Sheck, James, Black Siren, and the rest of their group entered the IDND vault, escaping after Team Arrow once again intercepted them following a short fight. Later, Sheck was with James and Black Siren when they were joined by Anatoly Knyazev, Ricardo Diaz, and Vincent Sobel, with all the members of Cayden's criminal cabal in the same place for the first time.

While waiting in one of their hideouts, Black Siren complains about not killing Jerry Bertinelli instead of threatening him, they are soon attacked by Green Arrow who shoots Sheck in the shoulder. Despite this Green Arrow is surrounded and is forced to retreat. Sheck is along with the Cabal when they defeat Green Arrow and Jerry Bertinelli, which leads to Bertinelli's death.

When Cayden initiates his plan against Star City, Oliver Queen revealed Cayden being behind all the incidents and informed people of safe houses which will be unaffected by his devices. Cayden sent Sheck and Vigilante to attack one of the safe houses, but was met with resistance from Team Arrow and the New Team Arrow, during the fight Sheck managed to sneak up on Rene but before he shot him he is shot by Vigilante revealed to be a double agent, Sheck calls him a traitor but before he can shoot him he is shot in the head by Vigilante.