Meg's first task, on the next day, is to distinguish the real Mr. Jenkins from two Echthroi doubles, by identification of the (potential) goodness in him despite her personal grudge. The protagonists then learn that Echthroi are destroying Charles Wallace's farandolae, and travel inside one of his mitochondria, to persuade a larval farandola, named Sporos, to accept its role as a mature fara, against the urgings of an Echthros. In the process, Meg is nearly annihilated, and Mr. Jenkins is invaded by his Echthros doubles; whereafter Proginoskes sacrifices himself to "fill in" the emptiness of the Echthroi, and Charles Wallace is saved.