Heading back to Earth with Griffin and his best friend Dev for a brief but much-needed visit, the girls want nothing more than to catch up on the underground music scene of New York City. Unfortunately, thanks to Griffin's less-than-stellar space traveling skills, they accidentally pick up a hitchhiker. Or three hundred. Their many-legged stowaway beasties take up residence in the darkest, creepiest corners of Manhattan, leaving the gang no choice but to experience a very different underground than they bargained for.
Giant alien bugs aside, Griffin has some epic plans of his own for their trip, plans that involve a concert, an album… and the most outrageous marriage proposal that Earth has ever seen.