A teenager, Danny, is secretly infatuated with his teacher Peggy Noble, who is engaged to the unpleasant Coach Kelton. When his friend Lloyd invents a growth accelerator for produce, Danny uses it to accelerate his own growth, intending to reveal Coach Kelton's true nature to Peggy. However, upon his return to school as an adult, he's mistakenly identified as someone else.
14 Going on 30
A 14-year-old boy, Danny, uses a growth machine to transform into a 30-year-old in an attempt to get closer to his teacher, Peggy, but ends up mistakenly identified as the new school principal.