Crisis on Infinite Earths

Crisis on Infinite Earths is the name of the sixth annual Arrowverse crossover event between, , ​​​​​, , and. Additionally, events in the  episode and a two-issue comic,, tie into the crossover. It began over three nights in December 2019 from December 8 to December 10 and will conclude on January 14, 2020.

Synopsis
The "Crisis" event brings together the heroes from multiple Earths to battle against the Anti-Monitor, a godlike villain who threatens to destroy all reality.

Cast

 * Stephen Amell as Oliver Queen/Green Arrow and Oliver Queen/Green Arrow
 * Audrey Marie Anderson as Lyla Michaels/Harbinger
 * Tala Ashe as Zari Tomaz
 * Brec Bassinger as Courtney Whitmore/Stargirl
 * Melissa Benoist as Kara Danvers/Supergirl
 * Katie Cassidy as Laurel Lance
 * Tom Cavanagh as Dr. Harrison Nash Wells/Pariah and Professor Eobard Thawne/Reverse-Flash
 * Osric Chau as Ryan Choi
 * Kevin Conroy as Bruce Wayne
 * Jon Cryer as Lex Luthor
 * Erica Durance as Alura Zor-El and Lois Lane
 * Tom Ellis as Lucifer Morningstar
 * LaMonica Garrett as Mar Novu/The Monitor and Mobius/Anti-Monitor
 * Rick Gonzalez as Rene Ramirez/Wild Dog
 * Grant Gustin as Barry Allen/The Flash
 * Reina Hardesty as Joslyn Jackam/Weather Witch
 * David Harewood as J'onn J'onzz/Martian Manhunter
 * Juliana Harkavy as Dinah Drake/Black Canary
 * Tyler Hoechlin as Clark Kent/Superman
 * Camrus Johnson as Luke Fox
 * Chyler Leigh as Dr. Alex Danvers
 * Stephen Lobo as Jim Corrigan
 * Caity Lotz as Captain Sara Lance/White Canary
 * Nicole Maines as Nia Nal/Dreamer
 * Katie McGrath as Lena Luthor
 * Katherine McNamara as Mia Smoak/Blackstar
 * Dina Meyer as
 * Wentworth Miller as
 * Griffin Newman as Trivia host
 * Danielle Panabaker as Dr. Caitlin Snow/Frost
 * Candice Patton as Iris West-Allen
 * Amanda Pays as
 * Dominic Purcell as Mick Rory
 * David Ramsey as John Diggle/Spartan
 * Jesse Rath as Querl Dox/Brainiac 5
 * Alan Ritchson as Earth-9 hooded vigilante
 * Ruby Rose as Kate Kane/Batwoman
 * Brandon Routh as Dr. Ray Palmer/The Atom and Clark Kent/Superman
 * Matt Ryan as John Constantine
 * Hartley Sawyer as Ralph Dibny/Elongated Man
 * Johnathon Schaech as Hex
 * Ashley Scott as Helena Kyle/Huntress
 * John Wesley Shipp as Barry Allen/The Flash
 * Azie Tesfai as Kelly Olsen
 * Russell Tovey as The Ray
 * Elizabeth Tulloch as Lois Lane and Lois Lane's Earth-75 doppelgänger
 * Carlos Valdes as Cisco Ramon/Vibe
 * Curran Walters as Earth-9 masked vigilante
 * Burt Ward as Earth-66 citizen
 * Tom Welling as Clark Kent
 * Wil Wheaton as Earth-38 Doomsday Protestor
 * Cress Williams as Jefferson Pierce/Black Lightning
 * Robert Wuhl as Earth-89 citizen

Trivia

 * The title of this crossover, Crisis on Infinite Earths, is also the title of a limited series published by DC Comics from 1985 to 1986.
 * This is the first crossover:
 * Where the title of the crossover was revealed at the end of the previous crossover (​​​​​).
 * To consist of five episodes.
 * To have a one-month break between some of the episodes.
 * The break is accounted for within the crossover.
 * To have major tie-ins with episodes of and  that aired prior to the crossover.
 * To have a tie-in comic book series. The series is titled . It will be two issues long and both issues will contain "an in-canon story that ties directly into the crossover narrative" and "characters and concepts that couldn’t be included in the crossover."
 * To have an aftershow. The aftershow is titled Crisis on Infinite Earths Aftermath.
 * Brandon Routh reprising his role as Superman, having previously portrayed the character in the 2006 film Superman Returns. The iteration of Superman that Routh is portraying is the same character, but is now based on the Kingdom Come storyline.
 * All currently airing Arrowverse television series will deal with the fallout from this crossover in the remainder of their current seasons.
 * Both Michael Rosenbaum and Alan Ritchson were offered the chance to reprise their roles as Lex Luthor and Aquaman respectively from the television series Smallville in this crossover. However, Rosenbaum declined and Ritchson had to decline due to scheduling issues.
 * Similarly, Cameron Cuffe was offered the chance to reprise his role as Seg-El from the television series Krypton. However, like Ritchson, he had to decline due to scheduling issues.
 * Nicolas Cage was also reached out to, presumably to portray a version of Superman, a role he was set to portray in the canceled film Superman Lives.
 * Ritchson did ultimately appear in the crossover, albeit in an uncredited cameo as Hank Hall from the television series Titans.