Episode Overview
Rambaldi's disastrous endgame starts to take shape when a massive version of the Circumference/Mueller device appears above a city in Russia, driving the locals to madness. After a hurt Dixon reveals that Irina is still alive, Sydney, Nadia, and Jack embark on a mission to locate her. Irina had been captured and cloned through Project Helix to create the illusion of her death. Sydney and Nadia trace Irina to a camp in Tikal, where she is held by Elena's forces. It turns out Irina was actually fighting against Elena's organization, the Covenant, and was working to thwart Rambaldi’s endgame. She confesses to destroying a crucial page related to that endgame but ultimately succumbed to torture and recreated it for Elena. Following a brief pause, their transport heads toward Russia, and Sydney, Vaughn, Jack, Nadia, and Irina parachute into the fray, confronting Elena, Sloane, the Circumference, and