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The Journey (Animorphs, No. 42) (edition 2000)
The Journey by K. A. Applegate
Amazon.com Product Description (ISBN 0439115167, Paperback)The Helmacrons need more power to escape the earth's atmosphere, so they have returned to demand the morphing cube. When Rachel tries to destroy their ship, the tiny egomaniacs bail - right into Marco's left nostril. And the other Animorphs have to get them out before the little aliens do some real damage.
(retrieved from Amazon Thu, 12 Mar 2015 18:23:49 -0400)
Rachel and Ax must evict the tiny alien Helmacrons from Marco's head and prevent them from stealing the morphing cube.
(summary from another edition)
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