I liked this book. It had good characters, a good plot, and tied all books in the My Teacher Is An Alien series together very well. However, some things were exceedingly unrealistic. A good example is the captain of the spaceship. For anyone who doesn't know, this captain is a sort of fish tank like box who can speak and think, and supposedly his species from his planet are advanced enough to join the League of Worlds. This is utterly ridiculous. The only thing that sets us humans apart from is one gesture: thumb to finger. Even if a box had a brilliant idea, he would not be able to carry it out because he would have no way to carry it out. He could not get the supplies, put them together use his invention, because he cannot grip. I rest my case.