Crisis on Earth-X, Part 1

Synopsis
Barry and Iris’s wedding brings the gang together, but things go awry when villains from Earth-X attack the ceremony. All of the superheroes band together with help from their super friends like Citizen Cold, The Ray, Felicity Smoak, Iris West and Alex Danvers to take on their most formidable villains yet. Earth's mightiest heroes - Green Arrow, Supergirl, The Flash and White Canary - lead their teams into battle to save the world.

Main/Featured Characters

 * Kara Zor-El/Kara Danvers/Supergirl
 * Alex Danvers
 * Oliver Queen/Green Arrow
 * Felicity Smoak
 * Barry Allen/The Flash
 * Iris West
 * Cisco Ramon/Vibe
 * Caitlin Snow/Killer Frost
 * Joe West
 * Harrison Wells
 * Wally West/Kid Flash
 * Sara Lance/White Canary
 * Martin Stein/Firestorm
 * Jefferson Jackson/Firestorm
 * Mick Rory/Heat Wave

Villains

 * Oliver/Dark Arrow
 * Kara/Overgirl
 * Tommy Merlyn/Prometheus
 * Eobard Thawne/Harrison Wells/Reverse-Flash
 * Shay Lamden/King Shark
 * Dominator

Other Characters

 * Winn Schott
 * Mon-El
 * J'onn J'onzz
 * Unnamed
 * David Singh
 * Cecile Horton
 * Nora West-Allen
 * Lily Stein
 * Clarissa Stein

Objects

 * Supergirl suit
 * Green Arrow suit
 * The Flash suit
 * Killer Frost suit
 * Waverider
 * White Canary suit
 * Firestorm suit
 * Quantum splicer
 * Firestorm Matrix
 * Dark Arrow suit
 * Overgirl suit
 * Prometheus suit
 * Reverse-Flash suit
 * Unnamed person's suit
 * Breach
 * Interdimensional extrapolator
 * Kara Zor-El's glasses

Weapons

 * Bow and arrow
 * Guns
 * Swords
 * Heat gun

Events

 * Nazi invasion

Locations

 * Earth-X
 * Earth-1
 * Earth-38
 * National City
 * D.E.O. headquarters
 * Star City
 * Bunker
 * Central City
 * S.T.A.R. Labs
 * Pipeline
 * CC Jitters
 * England
 * England