Byl jednou jeden polda.

The film, which opens with students arriving at a police academy, is a crazy comedy that is more a series of zany episodes and jokes than a coherent story. They are linked by a simple plot in which the commander of the police academy, Major Maisner, searches among his recruits for an alleged FBI spy and, after a not-so-subtle practical joke, gets into a dispute with his subordinate, a dispute that ends in a genuine bank robbery.