Elseworlds

Elseworlds is the name of the fifth annual shared multiverse crossover event between ,, and. The crossover will air over three nights from December 9th to December 11th, 2018.

Synopsis
The three-night event begins with Arkham Asylum doctor John Deegan rewriting reality, which results in Oliver and Barry swapping lives. In this new reality, the two heroes are the only ones that know that they are in the wrong lives and have each other's powers.

Cast

 * Stephen Amell as Oliver Queen/Green Arrow and Barry Allen/The Flash
 * Grant Gustin as Barry Allen/The Flash and Oliver Queen/Green Arrow
 * Melissa Benoist as Kara Danvers/Supergirl
 * Ruby Rose as Kate Kane/Batwoman
 * Tyler Hoechlin as Clark Kent/Superman and TBA
 * Elizabeth Tulloch as Lois Lane
 * Cassandra Jean as Nora Fries
 * Jeremy Davies as Dr. John Deegan
 * Juliana Harkavy as Dinah Drake/Black Canary
 * LaMonica Garrett as Mar Novu/The Monitor
 * Emily Bett Rickards as Felicity Smoak
 * David Ramsey as John Diggle/Spartan
 * Carlos Valdes as Cisco Ramon/Vibe
 * Danielle Panabaker as Caitlin Snow/Killer Frost
 * John Wesley Shipp
 * David Harewood as J'onn J'onzz/Martian Manhunter
 * Jesse Rath as Querl Dox/Brainiac 5
 * Echo Kellum as Curtis Holt/Mr. Terrific
 * Bob Frazer as Roger Hayden
 * Mehcad Brooks
 * Chyler Leigh as Alex Danvers

Trivia

 * This is the first crossover since Heroes Join Forces to not include.
 * However, the Legends will make some sort of appearance in.
 * The title of the crossover, Elseworlds, is a reference to a publication imprint produced by DC Comics for stories that took place outside of the DC Universe canon.
 * Elseworlds will focus on five core characters. Those characters will be Oliver Queen/Green Arrow, Barry Allen/The Flash, Kara Danvers/Supergirl, Clark Kent/Superman and Kate Kane/Batwoman.
 * There will be two Supermen and one of them will be wearing a black suit.