Danny is hopelessly in love with his teacher Peggy Noble. Of course she doesn't even notice him while she plans to marry the obnoxious coach Roy "Jack-jaw" Kelton. When Danny's friend Lloyd invents a growth accelerator for fruit and vegetables to "solve world hunger", Danny uses it on himself and as an adult tries to show her Roy's real personality. However at his first appearance at school as an adult, he's mistaken for someone else...
| Actor | Role |
|---|---|
 Steven EckholdtAdult Danny O'Neil / Harold Forndexter | Adult Danny O'Neil / Harold Forndexter |
 Daphne AshbrookPeggy Noble | Peggy Noble |
 Adam CarlLloyd Duffy | Lloyd Duffy |
 Gabriel OldsDanny O'Neil | Danny O'Neil |
 Irene TedrowAunt May | Aunt May |
 Patrick DuffyActor in Black and White Movie | Actor in Black and White Movie |
 Harry MorganUncle Herb | Uncle Herb |
 Loretta SwitMiss Horton | Miss Horton |
 Alan ThickeReal Harold Forndexter | Real Harold Forndexter |
 Dick Van PattenPrincipal John Loonies | Principal John Loonies |
 Rick RossovichRoy «Jackjaw» Kelton | Roy «Jackjaw» Kelton |
 Kit McDonoughDanny's Mom | Danny's Mom |
 Richard McGonagleDanny's Dad | Danny's Dad |
 John IngleMr. Thomby | Mr. Thomby |
 Sal ViscusoMr. Lloyd | Mr. Lloyd |
 Amy HathawayYoung Peggy | Young Peggy |
| DDavid C. CobbBeefy Jock | Beefy Jock |
 Debbie EvansPolice Officer | Police Officer |
| DDavid HessNewscaster | Newscaster |
| RRachel JacobsOdemeyer | Odemeyer |
| RRichard BarnesWaiter | Waiter |
 Judith JonesNagel | Nagel |