A young outcast drifts into his imagination to escape his bleak surroundings while his father, a broken man, is lost in an alcoholic haze. To find his purpose, the son hatches a plot of revenge on the man who wronged his father.

Harry, Arch, and Dan head into Del Norte, a small town in the middle of nowhere. Harry decides to return home after a seven-year absence, but not before Dan runs afoul of a group of unsavory characters and Harry vows vengeance for the lad's death. Harry and Arch flee from the town. Harry's wife, Hannah, is none too pleased to see her wayward husband at her doorstep. Taking his wife's anger in stride, he asks only to be allowed to work as a hired hand....

A group of human mutants and a band of militant gorillas threaten to break the peace of the ape tribe and overthrow the leadership of the benevolent Caesar.