After his noisy garage band gets him in hot water, 15 year old Brewster Banner and his little sister Kimmy find themselves sent to a Babysitter's house while their mother attends a weekend convention - only to find that their gregarious old lady caretaker is actually the legendary super hero known as Agent Action. The trio find themselves on an action-packed, martial arts filled trip through the universe as they team up to stop the evil Commander Kruel from invading earth and claiming it as his own. Fighting evil robots, monsters and even suiting up as a hero himself are just a few of the unexpected moments of their wild weekend.