The Abalienated Creature

It's been a secret and only known to the secret organization. Everyone who work in it had made an oath to never reveal this facility even if it cost their lives. They collect and do experiments on supernatural aliens and abnormalities that can be found on earth. It's all been covered up to make people believe that this was all an act and a mistake. One day, they caught an alien across the north side of Iceland and it was still alive. They were very excited about it as every alien that they get was often dead or disintegrated. However, this time it was still alive and this open up to many possibilities. They decided to inject the gene of another alien to it so that it could became a hybrid in which this could reveal the natural behavior of the injected alien gene. The alien in which they named it as X01 was fine in the first few hours after the injection. However, it started to act weird and grown. The facility failed to contain this creature and it broke out from the facility. No one survive the broke out as they were all dead due to the contagious exposure to other dead aliens. The abalienated creature was still lurking within the cities while hiding and camouflage itself as one of us. However, there were no reports of any weird activities in the city as if people who had seen would not live another day to tells.