Applegate Katherine Alice. Megamorphs 04. Back to Before

After a particularly vicious battle, Crayak sends the Drode to tempt Jake into accepting an alternate reality in which the Animorphs did not walk home through the abandoned construction site, did not meet Elfangor, and did not become Animorphs. The results are drastic: a friendless Tobias joins The Sharing, and is infested by a Yeerk who is later revealed as a spy for Visser One, and is killed. Marco- now dating Rachel in this world- runs into his mother, but she escapes before he can confront her. Jake discovers that his brother Tom is involved with dangerous dealings after a Yeerk security leak. And all the while, Cassie has a strong feeling that all is not right. Ax manages to escape from his Dome Ship, and begins to warn the people of Earth about the Yeerk presence.Megamorphs #4: Back to Before is the fourth and final book in the Megamorphs series, a spinoff of the Animorphs series. With respect to continuity, it takes place between The Other (#40) and The Familiar (#41).