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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.
A Mars expedition arrives on the Red Planet in the Mariner Valley. After planting the American flag, Major J. Allen Carter checks for water readings and notices a nearby rock outcropping. Carter chips at a crystal at the top of the outpost and removes it, just as something emerges from the nearby soil. Carter and the other astronaut, Ed Reiss, back off as the ground ruptures but Carter falls back into the crevasse...Read the full recap
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
When it came time to choose the line-up of superheroes for The Justice League, Bruce Timm and his fellow producers wanted a second female character on the team to accompany Wonder Woman. They chose to replace Hawkman on the team with a revamped Hawkgirl.
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.
Superman: I'd like to stay and look into it, but I'm expected back in Metropolis.
Batman: Another key to the city?
Superman: Here, it's a signal watch. Call if you need any more help. (flies off)
General Wells: With all due respect, Senator, we can't entrust the security of the entire world to one man.
Superman: I understand your feelings, General. And when Senator Carter first approached me, I was reluctant to get involved. But after meeting with him and his advisers, I became convinced that I could make a difference. I have fought hard over the years to earn your trust, and I solemnly swear, all of you, that I will continue to uphold the ideas of Truth and Justice, not just for America, but all the world.
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.
J’onn: I am J’onn J’onzz. (offers his hand to Batman)
Superman: Don’t take it personally, J’onn--he doesn’t trust anyone.
J'onn: A wise policy.
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.”
This three-parter episode takes its name after the comic book series published by DC Comics. Originally, in the 60s and 70s a compilation specials were released under the title Secret Origins of Super Heroes. However, the most prominent collections bearing the short title were later published from 1986 to 1990.