Alias Season 4 Episode 22 Before the Flood

Jack, Sydney, Vaughn, and Irina parachute into Sovogda, trying to dismantle a giant red ball turning people into zombies. Meanwhile, at APO, Weiss and Marshall blackmail the Russian Minister to access the Russian satellite codes, which leads them to learning that Elena Derevko is uplinking the satallite. Now, Jack, Sydney, Vaughn, and Irina have to save Nadia, and stop Elena and Sloane.