1. Authorized Personnel Only (Part 1)

Complete story — includes the ending

Sydney entices the Aurine-12 isotope away from Russian nuclear scientist Yuri Komorov. Fighting a thug, she holds onto cargo-strapping, dangling outside the speeding Belarus / Latvia train.... Shanghai 72 Hours Earlier: Sydney and Brodien run from agents, disguising themselves as ravers to escape. For "rogue behavior," CIA Director Hayden Chase strips Sydney's clearance, assigning her to Langley's mail-room. Sydney, "I quit." In D.C., Vaughn too wants to quit. Weiss urges, talk to Sydney first. Sydney enters the secret subway black-ops stronghold. Chase is, "glad you found us," and Brodien "has no idea it was a charade." Dixon, Jack and Vaughn are also "handpicked" for Sloane's team – their first mission, Komorov's isotope; their new name, Authorized Personnel Only. Presently: Carrying fake isotopes, Vaughn meets Vadik's buyer, Kazu Tamazaki, who recognizes Vaughn. He warns Sydney before dealing with a large Russian thug, then rescues her. Mission successful, they make love. Sloan identifies Ramon Vadik as #26 of CIA's "Most Wanted" assigning Sydney to debrief infiltrator, Nadia Santos. Sloan claims he gave Rambaldi's "Sphere of Life" to the government. Sydney realizes, "this position. You bought it." She's angry with Sloan, and Jack (after events in Wittenberg ).