uh i know!
a group of scientists and doctors were sent up to mars 80 years ago because word had gotten out of this deadly zombie virus, they were s to find a cure for this virus. they built a return space ship from the old spaceship that was used to get to mars! this was to be used for when the cure was finally found!
sadly, over these 80 years nothing was found- the scientists and doctors had to have families to keep this area alive, they taught them everything that they knew, in hopes that they continue the work and find the cure, we the offspring of these doctors and scientists are the ones on the map ok
we found the cure and were getting ready to get on the return space ship, but there was something missing so a person went to the original space ship and went to the deep bottoms of the ship in order to get it, but what we didn't know was that 80 years ago, a person who had the virus had gotten into the ship without being noticed and died in there!
this person who went for the needed part got sick with the virus, infected almost everyone!
there were only a few people left,