Alien Invaders 1: Rockhead - The Living Mountain
Max Silver
Five awesome aliens have been unleashed from the darkest corner of the galaxy – and they’re out to destroy the universe. Only Cosmo, a young boy from planet Earth, has the power to stop them. Recruited by the elite defence organisation G-Watch to defend the galaxy, Cosmo must prove himself and commence battle against the deadliest aliens in space.
Reviews

I loved this book! I especially liked how the kid could turn into a monster. Kayus has got five mutants and his already sent one the the hammer fist to another planet.
Constable Mars Sudoku 26.10.2022

I liked Cosmo. He is really brave. The story was exciting, especially where Cosmo gets a sword. I would recommend it to anyone who likes a good story.
Prince Race-car Spaceship 21.08.2020

This book is bit boring to read ...I like cosmo in this story.
Anonymous 05.08.2020

Cool!
Master Gargoyle Bojangles 17.07.2020

A lot of action and a fab book!
Anonymous 16.08.2014

Because he has awesome powers.
Anonymous 30.07.2014

Really exciting story with amazing characters.
Anonymous 23.07.2014

I like this set of books
Anonymous 24.06.2014

i like this book but it is a boy book
Anonymous 24.06.2014

The book was cool and exciting. Cosmo could change into different types of aliens.
Anonymous 24.06.2014

cool cool and even more cool
Anonymous 23.06.2014

It is a really exciting book with cool monsters
Anonymous 20.06.2014