This will be the story line mission you receive before getting the option to leave for Subway Town (Disc 2), you will receive a job from Captain Marshall to go back to Dead City. This return trip can be a little confusing for some and challenging for others on higher difficulties as now you have Mutants & Authority inside. Watch out for Authority Snipers and the few times you have to defend a certain spot from Mutants. Recommend a lot of Wingsticks and the Shotgun as well as any armor piercing ammo in this level.
Note: This is the only time you can retrieve the Drone Card. It's on top of a coffee table underneath an escalator right after seeing a Drone.