Spavid wird erwachsen und das wird auf seinem Heimatplaneten Merthoz groß gefeiert. Eine große Delegation der Galaxy High, einschließlich unserer drei Helden und einiger Lehrer, fliegt zum Merthoz, um den Feierlichkeiten beizuwohnen. Wieder zurück auf der Erde verfügt Spavid auf einmal über ungeahnte Superkräfte. Alle Merthozianer erwerben diese bei Eintritt ins Erwachsenenalter. Nun ist Spavid ein großer Held und die Zeitschrift Space Marshall Aktuell will eine Titelstory über ihn schreiben. Als er gerade bei einer Fotosession ist, wird sein Heimatplanet Merthoz von den bösen Werthozianern angegriffen. Alle Marshalls der Galaxy High fliegen los, um Merthoz zu beschützen, nur Spavid kriegt nichts mit und bleibt zurück..
We open on Spavid’s home planet, Merthoz, where the GH space marshals attend a very special ceremony – a ceremony where Spavid is recognized as an official Merthozian adult! When they return to school, Spavid starts to realize that the ceremony was more than just symbolic. As an "adult," Spavid has been bestowed with a wide array of impressive alien powers! Suddenly, Spavid can move objects with his mind; has the ability to become invisible; and discovers that he can fly! As a result of his newfound skills, he quickly becomes the most popular space marshal at Galaxy High – so much so, that Spavid’s personality begins to change. Because of all the attention he’s receiving, the once humble and helpful alien teen quickly becomes an ego-maniac. And when "Space Cadet Quarterly" comes a-calling, asking Spavid to be the cover model of an all-Spavid issue, he suddenly finds himself too busy to even bother with his space marshal duties. Ultimately, Merthoz comes under attack (from its arch nemesis planet Werthoz), and, with Spavid nowhere to be found, the other marshals head for the planet to try and help. The attacking aliens are too much for the marshals to handle alone. When Spavid finally gets word of the assault, he shows up to help – using his knowledge to defeat the intruders. In the end, Spavid decides to return his powers until he feels he’s adult enough to handle them. In a b-story, Brett becomes jealous of Spavid when his scientific article that was to appear in "Space Cadet Quarterly" gets bumped for an all-Spavid issue.
