The Pearson family heads to a vacation home in the country for some quality family time, hoping to reconnect and unwind. However, things take a surprising turn when the kids discover that their attic is occupied by a group of small, green aliens who have crash-landed on Earth. These aliens, known as the Zirkonians, are attempting to use the house's satellite dish to contact reinforcements for an invasion. Determined to protect their home and the planet, the siblings decide to take matters into their own hands without involving their clueless parents.

With creativity and tech-savvy gadgets, the kids engage in a series of humorous and thrilling battles with the diminutive invaders. They quickly learn that the aliens possess advanced technology that can control human minds, adding a layer of complexity to their mission. Despite being outmatched in terms of sheer technology, the children’s resourcefulness and teamwork give them an edge in this high-stakes showdown. The young heroes must now outwit the Zirkonians while keeping their parents oblivious to the escalating chaos, leading to a series of comedic and action-packed encounters.