A Random
SCIFI.radio story

Earth is chosen as the final battleground for an intergalactic war between two microscopic species who want to plug us into a power grid and use us as living batteries even though they are only slightly radioactive and might be overpowered by the army, navy, air force, space force and/or marines , but scientists create a new weapon which kills them all.
The End.
but they die from catching the common cold.
The End.