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.
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)
Set to conclude the Tomorrowverse of DC Comics animated features.
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).