Not solanum, not radiation, not voodoo, not even some microbe picked up by the Venus probe. By what means shall the dead be made to rise? By the same means that your pizza tastes awesome and your grandma's toes look like movie-theater popcorn: FUNGUS!
Some crybaby fungus in Thailand (I'm looking at you, Ophiocordyceps unilateralis) got sick of the shitty political climate and castaway coconut bits and decided to entertain itself by seizing the nerve centers of carpenter ants, destroying their organs and sending them on a well directed death march to the fungus's dinner table.
Read the article at livescience.com.