Ricardo Garay 
Hunt the Zirt Zlunder 

This series of little alien guardians of nature that come out of your planet in pursuit of the biggest polluter of the universe, the wicked Zirt Zlunder. He escapes and comes to stop on Earth. In this book begins the saga of the Little Guardians, crossing the universe behind the fearsome Zirt Zlunder the biggest polluter of all galaxies. They chase in an attempt to arrest Zirt Zlunder before he comes to earth to pollute even more our planet.