Sean and Holly's dad has the absolute coolest job in Grover's Mill. He owns Humongous Studios, a wacky filmmaking company that produces the wildest horror movies you have ever seen. For his latest project, he has built a massive, terrifying robot octopus to be the star of the show. You will join Holly, Sean, and their friends as they score an exclusive behind the scenes tour to see how movie magic is really made. But the excitement quickly turns to terror when the mechanical monster goes completely out of control. The Gigantopus is actually being commanded by an alien master who plans to use the giant octopus to suck the entire town of Grover's Mill into outer space. You must team up with the kids in a spectacular, big screen battle to defeat the alien threat. Grab your popcorn for an explosive, out of this world movie adventure.