Royal Canadian Mountie Dudley Do-right is busy keeping the peace in his small mountain town when his old rival, Snidely Whiplash, comes up with a plot to buy all the property in town, then start a phony gold rush by seeding the river with gold nuggets.

Madeline is married to Ernest, who was once arch-rival Helen's fiance. After recovering from a mental breakdown, Helen vows to kill Madeline and steal back Ernest. Unfortunately for everyone, the introduction of a magic potion causes things to be a great deal more complicated than a mere murder plot.