When Greg, the green alien, metGary for the first time, he had no idea his life would become so exciting, so full of unbelievable adventures! For their first adventure, Greg and Gary had to discover the source of some strange sounds coming from a huge cave.This time things are more complicated. They have to find the Halloween characters lost in the Roca Mountains and help them get get back to Earth before the night of Halloween.Will they be able to do it and how? Curious? Read the story!