The annual Junior Prom is at hand, and the students of the Conserver Military Academy are making their arrangements for this famous function. Jack Carter and Ned Graves invite two out-of-town girls to be their guests at the festivities. The girls, Maud and Alice, accept the boys' invitation, with the understanding that Jack's Aunt Nellie will act as their chaperon. It is so arranged and preparations made accordingly. Shortly before Prom Day, Jack is notified that Aunt Nellie cannot be present. The boys are much put out at this bit of news and are about to call the engagement off, when suddenly a bright idea occurs to them. They arrange with Sammy Stone, one of their friends, to impersonate Aunt Nellie. Sammy consents and plays the part. Outside of several embarrassing situations that arise, the scheme works out all right until Sammy, in his elaborate ballgown, attempts to dance with one of the professors. His identity is discovered and he lands in the guard house. Here his friends visit him and offer their condolences to "one of our best little chaperons."
—Moving Picture World synopsis