Too many aliens! - Bruce Coville

Pleskit's new in school. He's also purple, bald and has a single stalk growing out of the top of his head. It's going to be an interesting first term...

Pleskit's pen-pal Maktel, is making a short visit to Earth. But it's difficult having two best friends in the same town. And when Tim and Maktel form a friendship of their own, things get tricky for Pleskit... Until all three of them are brought together by the news that a powerful alien force is plotting to sabotage the Fatherly One's plans for Earth. Can the boys help save the mission?