In this wacky sequel to the 80s family comedy, Wayne Szalinski, a somewhat clumsy inventor, is back with his family, trying to lead a more normal life after his previous shenanigans. However, when his two-year-old son, Adam, becomes his dad's new "project," things spiral out of control. As Wayne focuses his efforts on his new invention, he accidentally activates his old device that turns miniatures into giants, and this time, what starts as a small misunderstanding ends with Adam growing to a size even bigger than any mother could imagine!
Chaos ensues when Adam, now a 20-foot giant, decides to explore his surroundings. Problems multiply as the little giant has to deal with his own size and the dangers of the world around him. Meanwhile, the police and the military get involved, further complicating the situation. Wayne and his wife, Diane, race against time to reverse the effect before their son causes an irreparable disaster in the city.
With hilarious moments and family warmth, the film captures the essence of family chaos and the lessons that come with growing up. Amidst the disasters and fun, the Szalinski family manages to strengthen their bonds, reminding us that even in the most "giant" of moments, family love always finds a way to triumph.