The comic book "Crisis" starts out including more obscure DC heroes and their correspondent antagonists, rather than DC's mainstream icons. Dawnstar, Firebrand, Psycho Pirate, Killer Frost, Kamandi, Psimon, Geo-Force, Arion, Firestorm, Cyborg and the Earth-2 Superman formed the first team roster recruited by Lyla and the Monitor to fight the title multiversal apocalypse.
Set to conclude the Tomorrowverse of DC Comics animated features.
The Spectre's line, "Death is better looking" is likely a reference to The Sandman's incarnation of Death and her appearance in DC Showcase: Death (2019)
In the comic books, Power Ring from the Earth 3 Crime Syndicate was Hal Jordan. In this movie, he is John Stewart.
This is the second adaptation of "Crisis on Infinite Earths" as it was previously adapted as a crossover between the CW's DC shows as Crisis on Infinite Earths: Part One (2019), Crisis on Infinite Earths: Part Two (2019), Crisis on Infinite Earths: Part Three (2019), Crisis on Infinite Earths: Part Four (2020) and Crisis on Infinite Earths: Part Five (2020).