WARNING: Contains SPOILERS For Crisis On Infinite Earths, Part 1.

The first chapter of the long-awaited Arrowverse crossover Crisis on Infinite Earths was chock-full of Easter Eggs and references. Most of these were to the original DC Comics storyline which inspired the event, but a few referred to other comics and movies.

Scripted by Marv Wolfman with art by George Perez, the original Crisis on Infinite Earths forever redefined the DC Comics multiverse. For years, it had been the practice of DC Comics editorial to declare every alternate reality as its own Earth, as DC Comics bought out several other comic book companies and added their characters to their own roster. Unfortunately, it became all but impossible for anyone (even the editors) to remember that Plastic Man didn’t exist on the same Earth as the Justice League, or to keep track of which Earths Batman was retired and married to Catwoman and which ones he was still active. Crisis on Infinite Earths helped to eliminate this confusion, by rewriting reality so that there was only a single Earth where most of the popular heroes had existed, albeit at different points in time.

It was suspected that something similar would happen with the Arrowverse Crisis, with the characters from Supergirl migrating to Earth-1. Indeed, this has already come to pass in the first part of the event, with 3 billion refugees from Earth-38 fleeing to Earth-1 in the wake of a massive wave of anti-matter destroying their universe, in a scene taken directly from the original comics. Here’s a rundown of all the other Easter Eggs in Crisis on Infinite Earths: Part 1.

Originally published in 1985 to coincide with the 50th anniversary of DC Comics, the original Crisis forever redefined how comic book companies handled crossover events in terms of writing and marketing. Many comic book historians use Crisis on Infinite Earths to mark the end of the Bronze Age of American Comics. As with last year’s Elseworlds crossover event, Crisis on Infinite Earths utilized the same logo from the original comic book storyline for its title cards.

Doomsday Prophets and a Wil-ful Cameo

Our first look at National City on Earth-38 showed a street preacher with a sign screaming to anyone who would listen about how the Earth was doomed and not even Supergirl could save them. This character and his sign are a nod to a similar character from Superman 2, who was seen during the battle between Superman and General Zod. The character is played by Star Trek alumni and nerd icon Wil Wheaton, who has lent his voice to various DC Comics characters in several animated series. These include Aqualad in Teen Titans GO! and the Ted Kord Blue Beetle in Batman: The Brave and The Bold.

Spike The Dragon

The preacher was soon forced to eat his words, as Supergirl saved him and the rest of the people in the park from a fire-breathing dragon. Amusingly, Supergirl was on friendly terms with the dragon, whom she addresses as Spike. Spike is a shape-shifting alien pet, who takes the form of a dragon when he or his owner are threatened, and was previously seen in Supergirl, season 4, episode 6, “Call to Action.” Presumably the alien girl who owns Spike named him after Spike the Dragon from My Little Pony.

Lois Lane and Clark Kent’s Children

The episode soon cut to Argo City and showed Lois Lane and Clark Kent enjoying some downtime with their newborn son, Jonathan. In the current reality of DC Comics, Lois and Clark have a son named Jonathan, who shares the series Super Sons with the current Robin, Damian Wayne. Later, Clark noted that he always imagined living on Earth with Lois and having two kids. This could be a reference to either the mini-series Superman: Secret Identity (where Lois and Clark had two daughters named Carol and Jane) or Superman & Batman: Generations, where Lois and Clark had a son named Joel and a daughter named Kara.

Harbinger

ARGUS director Lyla Michaels was first transformed into the Monitor’s servant Harbinger in Arrow, season 8, episode 7, “Purgatory.” The scene in which she first revealed herself in her new form to Oliver Queen and Mia Smoak is repeated here in Crisis on Infinite Earths: Part One. Though her costume is quite different from the comics, (lacking a helm, but featuring full pants), the Arrowverse Harbinger possess the same power as the Lyla Michaels in the comics to teleport herself and others anywhere in the multiverse.

Strange Visitors

Before Harbinger retrieved Sara Lance and Ray Palmer to join the other heroes needed for the coming battle, the two Legends were seen competing in a trivia contest in Star City. Ironically, the two wound up losing because of an incident that occurred in Legends of Tomorrow, season 4, episode 1, “The Virgin Gary,” and Ray’s close encounter with Janis Joplin changing the name of her final song. The team that answered the final question correctly was named “The Strange Visitors.” This was a nod to the introduction of the first Superman TV show, The Adventures of Superman, which described him as a “strange visitor from another world.”

The Quantum Tower/Cosmic Tuning Fork

The Monitor tried to slow the anti-matter waves that threatened Earth-38 with the unveiling of a Quantum Tower; one of several he planted on key worlds throughout the multiverse. Though the name is different, the quantum tower resembles the giant cosmic tuning forks used by the Monitor in the original Crisis on Infinite Earth comics to accomplish the same thing. Presumably the Arrowverse writers felt that “quantum tower” sounded more impressive than “cosmic tuning fork”.

The Shadow Demon Army

The army that The Monitor warned would be coming to destroy the quantum tower turns out to be less substantial yet more numerous than the heroes were led to believe. Described as “shadow demons”, the followers of the Anti-Monitor are capable of becoming insubstantial yet are solid enough to be injured by punches and kicks from a skilled martial artist. The shadow demons made up the greater part of the Anti-Monitor’s forces in the original Crisis on Infinite Earths comics and looked almost exactly like how they are depicted in the show.

Green Arrow’s Last Stand

The climax of Crisis on Infinite Earths: Part 1 came as Oliver Queen made his last stand, facing the shadow demons alone to buy more time for his allies to evacuate Earth-38. Defiant to the end, Green Arrow kept shooting arrows until his quiver was empty, only to drop his bow and charge the demons, ready to fight them with his bare hands. This resembles the battle from a different Crisis-based comic book; 2008’s Final Crisis. In that comic, Oliver Queen made a similar sacrifice, facing a horde of Darkseid’s followers and several superheroes whose minds had already been taken-over by the Anti-Life Equation, in order to buy time for his allies to evacuate the Justice League Watchtower.

The Coming of Pariah

As Oliver Queen lay dying, the heroes were joined by a man whom Barry Allen identified as Nash Wells. The newcomer corrected Barry, saying that he was once Nash Wells but that he was “now simply a man serving his penance.” He went on to explain that he had freed the Anti-Monitor from his confinement, “only to become a pariah, sentenced to bear witness to his actions.”

In the original Crisis on Infinite Earths, Pariah was a nameless scientist whose research enabled the Anti-Monitor to launch his first attack on the positive-matter multiverse. Somehow this scientist became bonded to the Anti-Monitor, arriving on the worlds he meant to destroy moments before the anti-matter waves reached them. The Pariah of the comics differs slightly from the Arrowverse version, however, in that the comics version of Pariah was saved by the Monitor, who sought to use him to track his evil counterpart across the multiverse and chart how quickly the multiverse was deteriorating.

More: Arrow: The Anti-Monitor Has Already Tried (& Failed) To Stop Oliver