West and Gordon arrive in the town of Brimstone to meet with Professor Philip Colecrest. They are unaware that a gang led by Zack Morton has captured the professor and is torturing him for information. Morton attempts to capture the agents as well and everyone ends up in the old mine shafts below town. West and Gordon elude Morton, then find Colecrest, who has escaped his captors but been injured in the process. Gordon goes for a doctor and the end result is that Brimstone's tunnels are full of people - the agents, the doctor, the doctor's daughter (who comes after him), the gang, the professor, and, on top of it all, a mysterious old man who haunts the shafts like a ghost...
Tropes present in this episode:
- Ghost Town: Brimstone was apparently abandoned when the mine shafts beneath it caught fire. The only people Artie and Jim find there when they arrive are Morton, his gang and Colecrest.
- Go Mad from the Isolation: Captain Butler has been living in the mines since before the Battle of Five Forks. He had a companion for awhile, but the companion died so long ago that the only thing left of him is a skeleton wearing a Confederate uniform. He's insane now (though, all things considered, the amount of sanity he's managed to retain is rather impressive).
- Shell-Shocked Veteran: It's made very clear that Captain Butler will never recover from what the years of isolation did to him. He refused to abandon his post.
- Smug Snake: Zack Morton has no respect for anyone or anything but himself.