Mr. Muller wasn't sure how or why his whole life became altered. But, the thing he remembered from that one notable day, was him waking up, to find that his wife had gone missing, busy streets in front of his house deserted, and shops that were open for business being empty.

On that same day, He searched the whole town. Yet, nobody was in sight. Though all the houses and buildings looked the same. Animals had mysteriously disappeared. Cars were smashed with one another in the streets with no drivers inside. He tried turning on his television, but there were no national broadcasts. Everything just seemed very eerie.

At that moment, he was aware that something was not right. He was entirely alone. As if, everybody else had vanished.

Since that occurrence, he realized that he was the only person alive. He wondered–where did everybody go?

Mr. Muller was left clueless. He tried putting up signs around the town pointing any survivors to his home, but none came.

Days passed, and he continued to live. In confusion and uncertainty. He survived by eating food he had taken from convenience stores. Though, most of the food tasted like it had some weird chemicals in it. But, he didn’t want to starve, so he ate them anyway.

After a long period of time, without a shadow of a doubt, he became very lonesome. His wife was no longer with him. Nor his friends nor grandchildren. He wished that all this was just one big joke. But, it wasn't. He wanted to vanish as well. But, he had a change of mind. He needed to find an explanation to what was happening. He was desperate to know where everyone else had gone. So, he managed to continue living.

The sun still rose. The rain still poured. And the Earth was still spinning. However, again, for Mr. Muller, life had become very lonely at that point. 

After a few months of living companionless, still not a single human showed up. Mr. Muller finally gave up his ambition to find answers, and finally gotten used to the loneliness he was in. But, one gloomy morning, Mr. Muller woke up to a loud rattling noise. He went to his front porch to see a black cat standing in front of his door. A living cat. Mr. Muller was deeply shocked to see another living creature. He picked up the cat and hugged it in his arms. It meowed. Mr. Muller wondered how the cat was still alive and how it got to his house.

But, most importantly, Mr. Muller was happy. It had been long since he experienced anything joyous in this, now lonely planet. He brought the cat inside and walked to the nearest pet shop to grab some cat food. When he got home, he tried to feed the cat. But, the cat didn’t want to eat. Mr. Muller thought it just wasn’t hungry.

From that day on, the cat lived with Mr. Muller and kept him company. Life got a wee bit better for him. He took care of the cat, and they became friends. Days of living with the cat, Mr. Muller noticed something strange. The cat still didn’t want to eat, nor drink. Mr. Muller was confused. He then tried to feed it something other than canned cat food. He put a few spoons of fish into a small plate and gave it to the cat. The cat sniffed the plate−yet still, it showed no interest in eating at all. Though, Mr. Muller didn’t really make a big deal of it.

One evening, Mr. Muller was sitting down on his rocking chair. With the cat curling up on his lap. While petting the cat, Mr. Muller noticed an extremely thin metal chain around the cat’s neck. He didn’t notice it before. There was a tag on the chain. It says B-643. Mr. Muller unclasped the chain and decided to take a better look at it. He wondered what it meant. Maybe it was the cat’s name, given by it’s previous owner? But, that’s a weird name for a cat. Mr. Muller thought really hard for a few minutes. He couldn’t think of anything. So again, he didn’t make a big deal of it, and clasped the chain back around the cat’s neck.

The next day, Mr. Muller woke up. But, he wasn’t in his room nor was he in anywhere familiar to him. He was laying on a gurney. On the floor of the room, he saw a sleeping dog, with a tag that says B-647. From afar, Mr. Muller heard a conversation. A man said “The human subject is alive. After 5 months of experimenting, we can conclude that our copy of Earth is able to support life.”