Gordon meets up with Alyx Vance in the Nova Prospekt train depot. They discover that Dr. Mossman was actually a Combine spy working on Breen's side. Together, they search the prison for Eli Vance and Judith Mossman, all the while fighting off security forces. They split up several times, but finally they reunite to track down Mossman. She teleports herself and Eli out of the facility, getting to the Citadel, forcing Alyx and Gordon to take the risk in using the same teleporter to get back to Kleiner's lab.
