Hall and Charlie eventually arrive at the city of Munroe, where petty crime, from vandalism to armed robberies, is running rampant, more so because the town currently has no sheriff.

A task force of hostile alien invaders are preparing to enslave mankind with the use of hypno-wave devices and advanced androids; already they control the local authorities and military installations, one of which has become their base.

Through the public announcement system Howard appeals to the citizens of Munroe for help, and the thugs and hooligans whom Hall has previously thrashed join forces with the sheriff, just as the alien leader executes the final stage of his plan to take over Munroe by sending the local state police force to a festival and round up the townspeople.

Hall and his helpers engage the officers in a massive fist-fight and begin to win the upper hand until the alien chief decides to use his hypno-wave machine.

As Hall arrives there, the alien leader and his androids discover that their hypno-waves have no effect on the sheriff (due to an earlier treatment by Charlie's wonder device).