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Although Hopalong Cassidy (William Boyd) agrees to remain at Mesa City for a couple of days so that California (Andy Clyde) and Lucky (Rand Brooks) can partake in various amusements, the stay becomes more of an ordeal than a holiday when the local bank is robbed during a square-dance competition. A case of mistaken trunks puts California in jail and it is up to Hoppy to clear his name and catch the real culprits. The real bank robbers manage to escape in one of those newfangled horse-less carriages, but as horse-less carriages are wont to do, then as now, this one runs out of gas at the most inopportune moment. Co-scripted by character actress Ellen Corby, Hoppy's Holiday was produced by its star, William Boyd.