The Zero Hour - Alien invaders unfamiliar with war try to take over the Earth using meteorite attacks.

Blast of Doom - Underground fires are raging, and Marvel Boy needs to get them under control while investigating the cause.

Planetary Error - Young Paular Nine has been chosen to travel to the past, specifically the Earth-Venus war of the year 2000, and observe how that plays out. Despite clear instructions to the contrary, he interferes with history.

Circus Terror - A circus is being ravaged by fire, and Marvel Boy has to go undercover to find the responsible party.