The latest war between the United States Galactic Federation and the Arthropodan Empire is over, and humans and spiders are now allies bound by a treaty. Before anyone can enjoy the tentative time of peace, the scorpions reappear with a vengeance.
In response to the treaty agreement between the new allies, Colonel Joey R. Czerinski and his band of miscreant legionnaires are sent on a side trip to a terraformed Arthropodan asteroid to help the spiders battle the scorpions.
With their usual serendipitous screw-ups, the legionnaires manage to convince the scorpions to surrender. Those who were enemies become allies, and vice-versa.
Another alien species makes a cameo appearance, and the return of a feared nemesis puts everyone on alert as the laughs continue in this eighth installment of the military space saga gone wrong.