Hercules and his friend Marlon have just enrolled at the School of Intergalactic Agents, but they're both having problems. Hercules is a little young—and a little short—to make the grade, while Marlon just can't help being a coward. For their first Surveillance Operation, they're sent to Earth to gather information on a girl who's behaving strangely. But while they're away, the dreaded Blackbird plans to attack the School...