Grandpa is moving in with Peter’s family, something he is really excited about. That is, until Grandpa barges into Peter’s room and forces him to move upstairs. Peter adores his grandfather, but he wishes to reclaim his room. He doesn’t have any other option except to declare war! Peter concocts wild schemes with the help of his friends to force Grandpa to give up the room. Grandpa, on the other hand, is tougher than he appears. Rather than giving in, Grandpa intends to avenge himself.