: Rick Moranis and Marcia Strassman return as Wayne and Diane Szalinski. Their teenage son Nick (Robert Oliveri) also returns, while daughter Amy (Amy O'Neill) appears briefly before heading to college. The "Giant" Discovery
Set three years after the original film, the story follows Wayne as he works for Sterling Labs in Nevada on a project to enlarge objects. While babysitting his toddler son Adam, a lab accident causes the boy to be zapped by a particle beam. Unlike the first film’s permanent transformation, Adam’s growth is triggered by exposure to electricity, causing him to experience massive growth spurts whenever he is near power sources. Eventually reaching a height of over 100 feet, Adam wanders into the neon-lit streets of , viewing the city’s landmarks as toys while his family and authorities scramble to stop him before he causes major destruction. Production and Visual Effects
It also taps into a very specific parental fantasy and fear. Every parent of a toddler has looked at their child destroying a living room and thought, "What if they were 100 feet tall?" The film externalizes that internal panic. It turns the everyday chaos of parenting (tantrums, snack demands, wandering off) into literal, city-leveling disaster.
The film's special effects were a major achievement at the time of its release, with the creation of the giant Nick Szalinski being a particularly complex process. The film's director, Charles Shyer, worked closely with the special effects team to ensure that the giant scenes were both convincing and humorous.