Paperback. Mass-market paperback 1996 Scholastic. Avergae wear. Clean and unmarked; spine uncreased. Lightly tanned pages. 'Grades 4-6. This addition to the popular sci-fi/fantasy series continues the adventures of five young people who have acquired the power to morph into animal forms from their alien friends, the Andalites. This power has helped them to survive and keeps the evil Yeerk invaders at bay. Then Cassie starts hearing strange and disturbing messages in her dreams and realizes that she is receiving a distress call from a stranded Andalite. With Jake's encouragement, she decides that they must try to rescue the alien before it is killed by the Yeerk's leader. Danger mounts as they enter the ocean as dolphins to start their search, and Cassie suddenly understands what it means to be a leader. . . .'--Linda Bindner, School Library Journal, 1997.