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Danger Signal was based on a story by Rupert Hughes, the uncle of billionaire Howard Hughes. Arthur Hoops stars as an aimless young man who rises from a menial construction job to become political boss of the entire city. This overused plot device, mercilessly lampooned in Preston Sturges' The Great McGinty (1940), is played entirely straight in the earlier film. Evidently a performer of some stature in 1915, Hoops is permitted to play both the hero and the hero's father, via trick photography. Need we add that third-billed John Davidson is not the popular 1960s actor/singer of the same name.