There are 3 books in the The Glorkian Warrior series. The newest book is The Glorkian Warrior and the Mustache of Destiny which came out in 2016.

1
The Glorkian Warrior Delivers a Pizza

Book cover of The Glorkian Warrior Delivers a Pizza
The Glorkian Warrior isn't the brightest bulb in the box, so it's good he's got his trusty talking backpack to advise him as they set out on a perilous journey to deliver a pizza. The pizza's got clams and peanut butter on it, so it's not clear who's going to…
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2
The Glorkian Warrior Eats Adventure Pie

Book cover of The Glorkian Warrior Eats Adventure Pie
The Glorkian Warrior is back! Don't worry, he hasn't gotten any smarter. The Glorkian Warrior was doing so well! He almost had that rampaging space snake under control-when Buster Glark, his villainous rival in the Glorkian Corps, showed up to make fun of him! Buster laughed so hard at the…

3
The Glorkian Warrior and the Mustache of Destiny

Book cover of The Glorkian Warrior and the Mustache of Destiny
In volume 3 of James Kochalka's off-kilter science fiction series for young readers, the eponymous hapless space adventurer is joined by three horribly annoying little kids. Everything is terrible, and nothing is okay. Well, that's not entirely true. There's a really great mustache. And a valiant cup of coffee. And…