Rand Brooks

Eddie's science project, a robot, malfunctions.

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

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.

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.

A banker is trying to cheat people out of their silver-rich land. Hoppy learns that the banker is in league with an outlaw gang.