Johnny is a square‑jawed superagent who can traverse inner space, Dimension Zero, and uses his powers to fight evil across the universe. He is aided by the beautiful blonde Zena and the tiny alien Rhom from the Black Star. The series was an early Japanese‑American co‑production created by former Disney animator Joe Oriolo for Warner/Seven, a company formed when Seven Arts Production merged with Warner Bros. It began airing a year after its U.S. release.