剧情：影片改编自罗伯特·金梅尔·史密斯1984年出版的同名童书，故事围绕一个小男孩的“卧室保卫战”展开。 Peter is thrilled that Grandpa is coming to live with his family--until Grandpa moves into Peter's room, forcing him upstairs into the creepy attic. And though he loves his grandpa he wants his room back, so he has no choice but to declare war. With the help of his friends, Peter devises outrageous plans to make Grandpa surrender the room. But Grandpa is tougher than he looks. Rather than give in, Grandpa plans to get even.