Firebomb is the 16th episode of Season 2 of Alias and the 38th episode overall. This is the episode in which it is revealed what some of Rambaldi's mysterious artifacts really are: the pieces to build a reusable Microwave-Impulse-Bomb (Microwave-EMP) in the 15th century. Sloane is the one who controls it. Meanwhile, Vaughn begs Dixon to aid the CIA in rescuing Sydney, Will is called upon to participate in a crucial CIA briefing session, and Sydney notices that something with Francie is not quite right.