Okay I'm here so lemme explain
I read a book that had these characters called 'inquisitors' and they couldn't die. The only way to kill them was by removing these spikes at the back of their head.
What if the aliens experimented on the captive humans and created these sort of elite warriors to annihilate the rest of humanity. The chips or brands send these signals to the brain that makes them sort of reset and upload the data from the brand/chip into their memory, wiping any previous ones so that these 'elite warriors' are pretty much robots, slaves to the aliens will. Later on, maybe a few of us can have characters that remember or something.
Anyway, these elite monkeys are only created after the concentration camps start, and then the rebels start seeing these humans but they're hostile and really powerful and it kinda throw them off a bit.
I don't know just throwing that out there. Maybe it's good maybe it's awful. But I definitely think it should be set with advanced technology and I will try to brainstorm as we go :)

