The Nexus

The Nexus is the title of an ancient being who exercises control over parallel realms. It serves as one of the minor antagonists in the series, but is considered very powerful in being able to use parallel realms to its advantage. While very few have ever seen it as it appears, only Zerahkeil has physically met it. Most physically existent beings in the universe are unaware of its existence.

The Nexus makes its debut in the episode "Countdown to Zero".