It's a rather unbelievable coincidence that Doomsday touches down within an easy walk to Metropolis, Superman's home grounds (and the Justice League's most of the time). Yes, he's seeking out the greatest challenge, but does he have a "Greatest Challenge"-sense, or does he just read the local papers?
It seems iffy that the Guardians of the Universe as we know them would tolerate a Green Lantern implementing the kind of fascist state we see here, as established in Superman: the Animated Series in the episode "In Brightest Day..." (and in the JL episode "In Blackest Night" as well). However, the Guardians may be different in this alternate universe as well.
Alternate Superman: There are at least six different ways I could stop you right now.
Alternate Luthor: But they all involve deadly force, don't they? And you don't do that. No, you need me. You wouldn't be much of a hero without a villain. And you do love being a hero, don't you? The cheering children, the swooning women, oh you love it so much it's made you my most reliable accomplice.
Alternate Superman: Accomplice? What are you...
Alternate Luthor: You could of crushed me any time you wanted. But it wasn't the law or the will of the people that stopped you. It was your ego. Being a hero was too important to you. You're as much responsible for this as I am. So go ahead, fix it somehow, put me on trial, lock me up, but I'll beat it. And then we'll start the whole thing all over again...
Lex: What! I'll be out in days!
Wonder Woman: (threatening) Not with a broken leg you won't.
Batman: Have you read his mind yet?
J'onn: Martians don't do that to one another.
Batman: Can't or won't?
Alternate Hawkgirl: So, do you sleep better now?
Alternate Green Lantern: You know I do.
Hawkgirl: (seeing one of Lex's weapons) What is that?
Batman: Breakable, I hope.
Alternate Superman: You've been a busy little bat, haven't you?
Alternate Batman: What else is there to do around here anymore?
Alternate J'onn: And as long as you're down there, please try to get Batman out of that cave of his. Even I find it depressing.
Lex: So, Larry, how are the wife and kids?
Larry the Prison Guard: Fine, Mr. Luthor. And they love that big screen TV.
Lex: They'll love the new SUV even more.
Flash: Hey, I had to go! Okay? And there're some things I just can't do in a blink of an eye!
Alternate Green Lantern: C'mon, for old times' sake.
Alternate Batman: I hate old times.
According to the Justice League season 2 DVD, Bruce Timm and co. had earlier toyed with the idea of the League members wearing uniformed costumes. Timm contacted the president of DC Comics to ask for permission to do so, but he told him that they couldn't touch the "Big 3" (Superman, Batman and Wonder Woman), so the idea was nixed. Many of the costumes worn by the Justice Lords were originally planned as uniformed Justice League outfits.
The entire League appears in this episode as well as part 2.
According to Bruce Timm, the original idea for the story was for it to feature the Crime Syndicate, a long-time group of League-like villains from an anti-matter universe. However, it was changed at the last minute to make it more of a Justice League vs Justice League story.
Ron Troupe (a reporter from Superman: The Animated Series) is seen covering Doomsday's rampage.
The alternate Wonder Woman wears a costume almost identical to that worn by Wonder Girl (Donna Troy) of the original Teen Titans for the seventies and well into the eighties. Then post-Crisis on Infinite Earths it seemed like her secret origin started getting changed every other year and she changed costumes regularly until her death
Doomsday suffers a similar problem as Amazo did in "Tabula Rasa" - he is never mentioned by name, but is listed in the credits as "Doomsday."
The Justice Lord version of Batman has a similar emblem on his costume as did the Batman Beyond version. His Batcave also features display cases with Batman Family costumes similar to those that the Batman Beyond batcave had.
When Cartoon Network premiered this episode, they aired the two episodes back-to-back, without inserting closing credits at the end of part one or opening credits/recap at the beginning of part 2. They still listed the title and writer/director credits, though.
What a Crisis!
The story that the Justice Lords version of Martian Manhunter uses to lure the League into his trap is also the central danger - and plotline - of the 1985 miniseries Crisis on Infinite Earths, which redefined the DC Universe's continuity. In the miniseries, a villain called the Anti-Monitor caused various parallel-Earth dimensions to collapse on each other, resulting in a single, merged Earth that contained all of the DC Universe's characters (which had previously been spread across a confusing number of alternate realities). The miniseries revised and streamlined more than fifty years of DC continuity and became a landmark event in the history of comics. In the episode, the story that the Lords' J'onn tells the League describes the same plotline: the part we can hear clearly is "...and the dimensions appear to be collapsing on each other," and as the League's Batman and MM talk over him, the Lords MM continues in the background, saying "...perhaps by combining our forces, we may be able to avert this crisis which threatens all the infinite earths and all the divergent timestreams."
More Superman Movie action?
The opening scene of two male and one female hero busting into the White House and taking down the President parallels the invasion of the Kryptonian villains in Superman II.
Lois: It's gazpacho – it's supposed to be.
This situation echoes the one from Batman Returns when Alfred serves Bruce vichyssoise and he surprised exclaims "It's cold!" to which Alfred replies "It's vichyssoise, sir. It's supposed to be cold...". However, Superman wasn't talking about the soup.
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