Book Series · 18 Books

Galaxy Zack Books

In order from Hello, Nebulon! to Game Over, Nebulon.

The Prehistoric Planet
Hello, Nebulon!
Journey to Juno
Monsters in Space!
Three's a Crowd!
Where the story begins

First Book in the Series

Hello, Nebulon!
Sale price
$674
Book #1 · Picture Book · Ages 5–7 · 2013

Hello, Nebulon!

By Colin Jack (Illustrator)

A young boy moves to a new planet with his family and navigates a new school and friendships.

128 pages· 4,694 words· Est. 37 min read-aloud
5.0/7 Bookroo
$6.99Save 4%
Paperback
In reading order

Galaxy Zack Series

18 books · Published 2013–2022

#3
#3 in Series
Sale price
$674

The Prehistoric Planet

Picture Book · Ages 5–9 · 2013

A lost pterosaur needs help returning home. Can Zack and his team navigate the prehistoric world?

#1

Hello, Nebulon!

Picture Book · Ages 5–7 · 2013

A young boy moves to a new planet with his family and navigates a new school and friendships.

#2
Sale price
$674

Journey to Juno

Picture Book · Ages 5–9 · 2013

A young boy named Zack Nelson explores the planet Juno with his school's Explorers Club and makes a groundbreaking discovery

#4
Sale price
$574

Monsters in Space!

Picture Book · Ages 5–7 · 2013

A boy befriends a monster-like alien who is visiting his school on the planet Nebulon

#5
Sale price
$674

Three's a Crowd!

Picture Book · Ages 5–9 · 2013

A boy is excited to show his friend from Earth around his new home on the planet Nebulon

#6
Sale price
$674

A Green Christmas!

Picture Book · Ages 5–9 · 2013

Zack's Christmas plans change with a cosmic storm and mysterious green snow.

#7

A Galactic Easter!

Picture Book · Ages 5–9 · 2014

Zack faces a dilemma: win fairly or cheat on the candy planet.

#8
Sale price
$674

Drake Makes a Splash!

Picture Book · Ages 5–7 · 2014

Can Drake conquer his fear of water before their next space adventure?

#9
Sale price
$574

The Annoying Crush

Picture Book · Ages 5–9 · 2014

A robot's crush on Zack spirals into chaos. Can he fix it?

#10
Sale price
$674

Return to Earth!

Picture Book · Ages 5–9 · 2015

A planet-hopping boy's Earth visit turns chaotic when his dog goes missing.

#11
Sale price
$574

A Haunted Halloween

Picture Book · Ages 5–9 · 2015

Zack faces eerie events that challenge his disbelief in ghosts this Halloween.

#12
Sale price
$574

Operation Twin Trouble (12)

Picture Book · Ages 5–9 · 2015

Zack must mend his sisters' cosmic feud before it spirals out of control.

#13
Sale price
$674

Science Fair Disaster!

Picture Book · Ages 5–9 · 2016

Zack's science project malfunctions at the Intergalactic Fair. Can he fix it before chaos ensues?

#14

Space Camp

Chapter Book · Ages 5–9 · 2016

Space camp turns chaotic. Can Zack unite his cabin mates before summer is ruined?

#15

Ready, Set, Blast Off!

Chapter Book · Ages 5–9 · 2017

A galactic race turns chaotic. Can Zack lead his team to victory amidst turmoil?

#16
Sale price
$674

Cosmic Blackout!

Chapter Book · Ages 5–9 · 2017

Nebulon faces a cosmic blackout. Can Zack adapt without his tech comforts?

#17

Snow Place Like Home

Chapter Book · Ages 5–9 · 2018

Zack faces unexpected challenges on a galactic winter vacation. Can he overcome them before heading home?

Sale price
$674

Game Over, Nebulon

Chapter Book · Ages 4–8 · 2022

A game turns real, threatening Zack's world. Can he stop the villain?

Good to know

Common Questions

How many books are in the Galaxy Zack series?

There are 18 books in the Galaxy Zack series. It began with Hello, Nebulon! in 2013, and the newest book, Game Over, Nebulon, was published in 2022.

What order should you read the Galaxy Zack books in?

Start with Hello, Nebulon! and follow the series order — the books above are numbered #1 through #18.

What ages are the Galaxy Zack books best for?

The series is best for ages 4–9, based on the age ranges of the individual books.

Which Galaxy Zack book is the longest?

Space Camp is the longest book in the series at 5,178 words (128 pages).

Which Galaxy Zack book is the shortest?

Drake Makes a Splash! is the shortest at 4,463 words (128 pages).

The people

The Creatives Behind the Books

The authors and illustrators who bring Galaxy Zack to life.

01

Ray O’Ryan

Author
02

Colin Jack

Illustrator
03

Jason Kraft

Illustrator

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