The Journey is the forty-second book in the Animorphs series, written by K. A. Applegate. It is known to have been ghostwritten by Emily Costello. It is co-narrated by Rachel and Marco.
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Product Description
When the Animorphs try to stop the tiny alien Helmacrons from taking the morphing cube, Marco gets in the way and ends up with Helmacrons up his nose and inside his head.
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From Wikipedia
The Journey is the forty-second book in the Animorphs series, written by K. A. Applegate. It is known to have been ghostwritten by Emily Costello. It is co-narrated by Rachel and Marco.
In the article:
Product Description
When the Animorphs try to stop the tiny alien Helmacrons from taking the morphing cube, Marco gets in the way and ends up with Helmacrons up his nose and inside his head.