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...

Hercules and Marlon are in their second year of intergalactic agent school and they still have a lot to learn! But when their teacher is bitten by a strange alien creature, they'll need to put down the books and leap into action because the sickness affecting Teach seems to be spreading throughout the school...