A highly-polluted planet in an unknown location from what appears to have been another Session of BZPB, Alternia is the homeworld of Vriska Serket and almost certainly Sollux Captor, being a member of the same race as the former. Youths of the main race on Alternia were, at least at the time of Vriska's flashbacks, placed in the care of monstrous creatures known as lusus. The reason why is yet unknown. As well, it appears that this same race were/are nocturnal. As of Vriska's final dreaming flashback, it would appear that Alternia was destroyed when it was leveled by faling meteors; only a handful of its inhabitants somehow managed to survive.