|"Things were looking a little grim, but part of me was, admittedly, a little excited for a "reunion" of old friends."|
- "In the end, there was only one, a single black infinitude. Then the infinitude found release. And finally, the darkness broke, filling it with life. With the multiverse. Every existence multiplied by possibility. And spread out before space and time in infinite measure. Civilizations rose and fell. And rose again across reality's grasping expanse. Life, a precious gift, persevering in the face of every obstacle Until, finally, the age of heroes was born."
- —Oliver Queen
"Crisis on Infinite Earths: Part Five" is a special episode of the fifth season of , and the sixty-eighth and most recent episode overall. It aired on January 14, 2020. The episode is the fifth and final part of the five-part crossover, .
Worlds lived, worlds died. Nothing will ever be the same.
- Brandon Routh as Ray Palmer/The Atom, Ray Palmer/The Atom (archive footage), Clark Kent/Superman (archive footage), and Superman
- Caity Lotz as Sara Lance/White Canary
- Maisie Richardson-Sellers (credit only)
- Tala Ashe (credit only)
- Courtney Ford (credit only)
- Jes Macallan as Ava Sharpe
- Olivia Swann (credit only)
- Amy Louise Pemberton (credit only)
- LaMonica Garrett as Mobius/Anti-Monitor
- Nick Zano as Nate Heywood
- Dominic Purcell as Mick Rory/Heat Wave
Special appearance by
Special guest star
- Grant Gustin as Barry Allen/The Flash
- Rick Gonzalez as Rene Ramirez/Wild Dog
- Juliana Harkavy as Dinah Drake
- Cress Williams as Jefferson Pierce/Black Lightning
- David Ramsey as John Diggle/Spartan
- Tom Cavanagh as Harrison Nash Wells and Harrison Nash Wells/Pariah (archive footage)
- Danielle Panabaker as Caitlin Snow/Frost
- Chyler Leigh as Alex Danvers
- David Harewood as J'onn J'onnz/Martian Manhunter
- Nicole Maines as Nia Nal/Dreamer
- Tyler Hoechlin as Clark Kent/Superman
- Elizabeth Tulloch as Lois Lane
- Ruby Rose as Kate Kane/Batwoman
- Melissa Benoist as Kara Danvers/Supergirl
- Osric Chau as Ryan Choi
- Reina Hardesty as Weather Witch
- Audrey Marie Anderson as Lyla Michaels
- Eileen Pedde as President of the United States
- Jorden Birch as Co-Worker
- Pam Kearns as Female Fan
- Raul Herrera as Sargon
- Marcello Guedes as JJ Diggle
- Tiahra Allen as Sara Diggle
- Brec Bassinger as Courtney Whitmore/Stargirl
- Alan Ritchson as Earth-9 hooded vigilante
- Diane Guerrero as Crazy Jane
- April Bowlby as Rita Farr
- Joivan Wade as Victor Stone
- Derek Mears as Earth-19 entity
- Production for began on September 24, 2019.
- This episode was originally produced as the eighth episode of the fifth season of but aired prior to the official Season 5 premiere as a special episode.
- This is the first episode of to not feature Tala Ashe (Zari Tomaz) after signing on as a series regular.
- The synopsis has similarity with Roger Hayden's catchphrase in "".
- It is an exact phrase said by Psycho Pirate in the original Crisis on Infinite Earths comics.
- This part in addition to "" both aired on Grant Gustin's thirtieth birthday.
- The Super Friends cartoon theme plays at the end. Additionally, an open cage has the name Gleek on it. Gleek is known for being the pet monkey of the Wonder Twins, all three of whom debuted in the "Super Friends" toon.
- Only the Paragons initially having knowledge of the Crisis is a callback to the original comic, where only the key players in stopping the Crisis remembered.
- Earth-Prime is a reborn Earth-1 fused with Earth-38 and Black Lightning's Earth.
- This is also another nod to the comic Crisis, where the last five Earths in existence were merged into New Earth.
- Marv Wolfman, the co-writer of the original Crisis on Infinite Earths comic and co-writer of the previous part of the crossover makes a cameo as a fictional version of himself.
- Interestingly, Marv Wolfman asked for an autograph from the two most prominent heroes he killed off in Crisis on Infinite Earths, Flash and Supergirl.
- It would seem as though with the new Earth-Prime, the pre-Flashpoint timeline also merged with the post-Flashpoint timeline, as John Diggle, Jr. and Sara Diggle both exist.
- Clark Kent did not realize that he has two sons rather than his son, Jonathan from Earth-38's reality, although he is not a Paragon so therefore should have known. Though, it could be caused when J'onn J'onzz restored his memories before the final battle with the Anti-Monitor.
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