These names make sense only the "fat" is a bit funny. I made my own story that we (player) are some kind of agent trying to "neutralize" the lab because some type of an accident and all enemies (monsters we fight) got out. After the accident the mobs took over the lab and we (player) has been sent there to neutrilize the threat. We go thought out the levels and we reach the core. After we destory the core the mobs just vanish or something and the lab is saved with the world. The core was made during the accident by someone against the lab projects because he belived mobs are like animals and deserve to be free only did he get killed by the mobs.
I really like the story i made but i knew the story was just some theory. (edit: i spent 14 mins writing this reminding how it went)