Could “The Last of Us” really be predicting the apocalypse? The series, which is decidedly not a zombie series despite showing infected undead, hinges on the takeover of the parasitic Cordyceps fungus, which typically infects ants and insects. In “The Last of Us,” based on the videogame of the same name, the fungus has evolved and infected humans. Showrunner Craig Mazin revealed that the 1968 prologue in the first episode of the HBO series explained the very real possibility of Cordyceps fungus evolving due to climate change.