Rand Brooks

Eddie's science project, a robot, malfunctions.

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

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

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.

Hoppy is an agent of the federal government investigating the counterfeiting of both U.S. and Mexican money. His only clues are the name "Mordigan" and a drawing of a comet.