In mathematics, the title of this episode refers to a “space in which all possible states of a system are represented, with each possible state corresponding to one unique point.” This seems to mesh nicely with the episode’s description: “Everyone deserves to choose their own fate”, particularly if you correlate all the possible fates of the characters with the possible states of phase space.

Aside from delving into the possible fates of characters, we will also apparently be getting a bit more insight into the relationship between The Man In Black and his daughter.