Once Upon a Time... Space differs from the other titles in the Once Upon a Time franchise because the series revolves around dramatic content rather than an educational premise. The series still contains a handful of educational facts (such as an episode discussing the rings of Planet Saturn). The series succeeds Once Upon a Time... Man. It reprises almost the entire cast of characters from the previous series and adapts them into a science-fiction context. The story tells of the confrontation between many major galactic powers. Among them are the Omega Confederation, of which Earth is a member; the military republic of Cassiopée led by General Le Teigneux; and a powerful supercomputer which controls an army of robots. Once Upon a Time... Space features the adventures of Pierrot (son of Colonel Pierre and President Pierrette) and his friend Psi.