Title: Elfangor's Secret
Description: Tobias and his friends, a group of young people who have given the power to morph into animals in order to aid the alien Andalites in their battle against the evil Yeerks, face a life-and-death situation when Visser Four, a leader in the Yeerk invasion, finds a time machine.
Subjects: Science fiction, Juvenile fiction, Metamorphosis, Extraterrestrial beings, Fiction, Children's fiction, Behavior, fiction, Fantasy fiction, Mystery and detective stories, Animorphs (fictitious characters), fiction, series:Animorphs, collectionID:Megamorphs