Alias moves fluidly from episode to episode, from one mission into the next. Threads and plot points can unfold over the course of several episodes, but each has its own notable events and milestones too. So just for the fun of it, Dead Drop is the one where...

• Sydney shoots her way through the ice in Siberia.
  
• Sloane asks Jack to have someone investigate the mysterious phone call.
  
• Rebecca Martinez says she wants to investigate SD-6 with Will.
  
• they find Claus Richter, the first known case of the "Rambaldi" virus.
  
• Jack tries to give Sydey her mission before Vaughn to keep her from going to Irina.
  
• Sydney goes to Moscow to retrieve the map.
  
• Marshall makes Sydney a set of keys disguised as medals.
  
• Jack admits he's worried about losing his daughter.
  
• Sark first asks Sydney to come work for him.
  
• Irina gets her earrings back.
  
• SD-6 classifies Will a non-threat when he won't work with Rebecca.
  
• Dixon finds Emily's signature on the bed & breakfast's guest registry.
  
• Irina helps Sydney escape by telling her about the hidden escape tunnel switch.
  
• Irina asks Vaughn how you thank the woman who killed your father.
  
• Vaughn tells her that you don't.
  
• Jack arranges to have the house in Madagascar rigged to blow.
  
• The explosion implicates Irina and she is taken away for trial.
  
• Sydney thinks her mother betrayed her and apologizes for doubting Jack.

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