The Combat Zone (quest)

 is an unmarked quest in Fallout 4.

Quick walkthrough

 * 1) Kill the raiders.
 * 2) Speak with Tommy Lonegan.
 * 3) Speak with Cait.

Detailed walkthrough
You enter into a foyer with two bound raider "rulebreakers" taunting you from the cashier's cage. There is an advanced terminal which unlocks the cage door, but you can't free the raiders or anything. There is an expert safe and some loot in the cage. Upon entering the main room, you will come upon the end of a cage fight in progress with Cait and an unnamed raider, with several raiders watching on as Tommy Lonegan provides commentary. As you walk further in, the raiders will instantly become hostile and attack the Sole Survivor. There are 4 raiders, 3 raider scum, 2 raider psycho, and 1 raider waster.

After clearing the area, you will find Cait and Tommy hiding inside of the cage on stage for their protection, and after approaching Tommy he will be both grateful and enraged that his only form of clientele have been butchered before his eyes, and comments that he wonders if he should thank you or have his "little bird" disembowel you in front of him. After a brief talk, he realizes that Cait is a liability (and an addict), and insists that the Sole Survivor take her from him until he can straighten things out and eke out a better life for them both. He also awards you the purse of the last fight, and you are free to loot the rest of the building. From their, speaking to Cait will allow you to use her as a permanent companion.

The main room features chems, food, and low level weapons. It also has two cooking stations, a chem lab, weapons workbench, and armor workbench. A copy of Picket Fences is on a table in the front and there is a mini nuke in the back balcony. 2 ammo boxes, 1 tool box, and 1 first aid kit are also for the taking.