A scientist accidentally enlarges his toddler son using a growth ray. As the boy continues to grow at an alarming rate, the family must find a way to reverse the effects before it's too late.

When the inventor father accidentally shrinks himself and his wife, their teenage children must navigate their own home to find a way to bring them back to normal size before their parents come home.

The scientist father of a teenage girl and boy accidentally shrinks his and two other neighborhood teens to the size of insects. Now the teens must fight diminutive dangers as the father searches for them. On the brink of perfecting his state-of-the-art matter-shrinking machine, the suburban paterfamilias and indefatigable inventor, Professor Wayne Szalinski, realizes that his device truly works, when it zaps both his kids and next-door neighbors' sons. Now, to return to the relative safety of their home while being reduced to a mere quarter-inch size, they must venture out into the dense and perilous landscapes of their now-immense backyard: a hostile environment where nearly everything spells trouble. Can they exit the green maze of grass in one piece?