Search And Rescue is the twenty-first episode of Season 4 of Alias and the 87th episode overall. Rambaldi's catastrophic endgame begins to fall into place as a giant version of the Mueller device is found floating over a city in Russia, driving the citizens mad. After a wounded Dixon reveals that Irina is alive, Sydney, Nadia, and Jack set off to find her. Irina had been captured, and then duplicated using Project Helix, in order to give the impression that she was dead.