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While Superman participates in a plan for global disarmament, Batman discovers that aliens have infiltrated a power sub-station. When the same aliens launch an invasion of Earth using giant war machines, the two heroes come together and end up rescuing a third hero: the alien J'onn J'onzz.
George Newbern replaces Timothy Daly as the voice-role of Superman.
Michael Rosenbaum replaces Charles Schlatterthe as the voice-role of The Flash. Schlatterthe did the role in the Superman
episode "Speed Demons
This episode was released with the other two parts as a movie called Justice League.
This episode features Batman and Superman. The Flash and Wonder Woman have only small cameos. J'onn J'onzz is featured at the very end.
J. Allen Carter: Would you look at that? It's a little slice of Heaven.
Ed Reiss: If your idea of Heaven is a barren, lifeless rock.
J. Allen Carter: You have the soul of a poet.
Flash: Hey, the big guy's heart's in the right place. But gimme a break. I'm the fastest man alive, and even I can't be in five places at once.
Wonder Woman: These omens don’t bode well, Mother. Mankind may be facing it darkest hour.
Hippolyta: Then mankind will have to face it alone.
Wonder Woman: How can you say that?
Hippolyta: Whatever happens beyond these shores is not our concern. Here the gods will protect us.
Alien Invasion Plot
This three-parter shares some similarity with the invasion of Earth by "White Martians", as depicted in several different Justice League story arcs, written by Mark Wade and Grant Morrison.
Superman IV: The Quest for Peace
The world disarmament plot with Superman going before the UN General Assembly bears some resemblance to the movie Superman IV: The Quest for Peace.
Superman: I will continue to uphold the ideals of truth and justice, not just for America, but for all the world.
This statement refers to the end of the introductory monologue to the 1951 - 1957 The Adventures of Superman series, starring George Reeves. Such monologue ends like follows: “...who disguised as Clark Kent, mild-mannered reporter for a great metropolitan newspaper, fights a never-ending battle for Truth, Justice, and the American Way.”