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...
Steven Eckholdt
as Adult Danny O'Neil / Harold Forndexter
Daphne Ashbrook
as Peggy Noble
Adam Carl
as Lloyd Duffy
Gabriel Olds
as Danny O'Neil
Irene Tedrow
as Aunt May
Patrick Duffy
as Actor in Black and White Movie
Harry Morgan
as Uncle Herb
Loretta Swit
as Miss Horton
Alan Thicke
as Real Harold Forndexter
Dick Van Patten
as Principal John Loonies
Rick Rossovich
as Roy «Jackjaw» Kelton
Kit McDonough
as Danny's Mom
