The joke's on absent-minded scientist Wayne Szalinski (Rick Moranis) when his troublesome invention shrinks him, his brother (Stuart Pankin) and their wives (Eve Gordon and Robin Bartlett) so effectively that their children (Bug Hall, Allison Mack and Jake Richardson) think they've completely disappeared. Of course, this gives the kids free rein to do anything they want, unaware that their parents are watching every move.