Harry Shelby has been kept in knee pants for years by his overprotective parents, but the day finally comes when Harry is given his first pair of long pants. Almost immediately, he is expected to marry his childhood sweetheart Priscilla... but instead, Harry's first heady whiff of manhood has got him panting after Bebe, a "fast" woman from the big city. Mistakenly thinking that Bebe fancies him too, Harry risks everything to help her out when she lands in jail, only to end up in hot water himself. Through it all, sweet Priscilla waits for her man to come to his senses.

A meek Belgian soldier (Harry Langdon) fighting in World War I receives penpal letters and a photo from "Mary Brown", an American girl he has never met. He becomes infatuated with her by long distance. After the war, the young Belgian journeys to America as assistant to a theatrical "strong man", Zandow the Great (Arthur Thalasso). While in America, he searches for Mary Brown... and he finds her, just as word comes that Zandow is incapacitated and the little nebbish must go on stage in his place.