Rand Brooks

Eddie's science project, a robot, malfunctions.

Hoppy and California must avoid angry, suspecting ranchers to find Lucky who has been hypnotized by snake oil salesman Doc Richards.

Teacher Lola Blair is against building the saloon right next to her schoolhouse. When she is kidnapped, Hoppy rescues her and forces the saloon keepers to relocate.

Two greenhorns from the East are blamed for murder and claim jumping.

A bad guy has used several murders to drive all the inhabitants out of town in order to give his gang access to the oil which lies under the land.

Hoppy, California and Lucky are on vacation, but not for long. They come across bank robbers (who drive automobiles, something new). Nevertheless, the Bar 20 guys bring the bad guys to justice.