Cells are like tiny little earths in your body, they are lovely little peaceful worlds, but need to be taken care of with strict policing. Because of this fact, oxygen is jealous and wants to infiltrate the cell to find a home of it's own, but oxygen is a muslim and doesn't integrate well. All these god damn oxygens ever want to do is come in for a free ride, but they never help out, they are always just destructive to the cell community.

The human cell voted trump and decided it had had enough and it was time to act for the security of the cell.

The human cells are alerted that oxygen is approaching and sends out troops to the cell border in a defensive front line. The cell government builds a wall to keep out the oxygen. A horribly violent battle at the cell border ensues with a high number of casualties on both sides.

Many cell troops lay dead, and many oxygen terrorists are also deceased. The wall has been knocked down and some oxygen managed to infiltrate the cell. The cell government sends builders to remake the wall for the next push, but the cell has already lost some of it's best men. It is unclear how many more front line assaults the cell can handle before it is oxidized.

Surely, at this rate, there will not be enough troops or builders to stop the cell from destruction within say 100 years.