A cosmic storm thrashes a small planet inhabited by alien plant life, and plant spores are carried away from the planet, headed toward Earth. Meanwhile, as Josh, Brett, Yoko, and Fluffy are checking out a GH satellite for storm damage, they find themselves in the middle of a dogfight between two spacecrafts. When it becomes clear who the good guy is, the gang helps him run off the bad guy. After welcoming him aboard their ship, they discover that the friendly alien is Omni -- a teenage space marshal from another galaxy (the same space marshal that just won the Marshal Of The Milky Way Award, beating out Brett). It turns out that Gangus, the alien he was fighting against, was a prisoner at Omni’s space school. After he escaped, he destroyed the school and is now after Omni, who is only marshal he hasn’t yet captured. The gang (with the exception of Brett) takes an instant liking to their new friend and invite him back to Galaxy High.