
A loner travels with his horse companion chasing villains across the frontier.

Hoppy, California and Lucky come across bank robbers who drive automobiles; nevertheless, the Bar 20 guys bring the bad guys to justice.

One of Hoppy's Bar 20 ranch hands is tricked into participating in nefarious activities after being subjected to hypnosis.

Three bodies turn up in a frontier hotel; Hoppy solves the murders and chases the killers through unusually misty and dark locations.

Stagecoach robbers take the money Hoppy was going to use to buy cattle, so Hoppy, California and Lin go after them.