It all started 30 years ago in this very lab. It was pandemonium, sirens were going off, gunshots could be heard everywhere -it was a catastrophe.
A portal had been opened to another dimension and a carnivorous-being stepped out of the portal and started killing everyone.
Some managed to escape the lab and flee far, far away while some didn’t make it that far before being devoured.
After the interdimensional being finished its feeding, it fled back into the portal never to be seen again.
And legend has it that the monster comes out every 30 years so you better not be out at this time of the year…