Arden Jezek was Enzo Markovic's chief of security.
Arden was relaxing beside a pool where he saw Sydney slowly walk out of the pool wearing a bikini, catching Arden's eyesight. Arden observed Sydney walk into a secluded tent, undoing her bra, and followed her inside. However, Vaughn was also inside and Sydney ambushed him from behind, injecting him with a poison. Vaughn told him that he had a limited amount of time to live before the poison would kill him and forced him to take the two into Markovic's lab, where they successfully rescued James Lennox, a captured CIA agent.
After Arden helped Vaughn get into the system's main database so he could download the information about Project Helix, he knocked out Arden and gave him the antidote.