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.

Protagonists

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

Antagonists

 * Nazis
 * Dark Arrow (Oliver)
 * Overgirl (Kara)
 * Prometheus (Tommy Merlyn)
 * Reverse-Flash (Eobard Thawne)
 * King Shark (Shay Lamden)
 * Dominator
 * Ninjas

Other Characters

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

Teams and Organizations

 * S.T.A.R. Labs
 * Nazi
 * SS
 * CCPD

Objects and Concepts

 * Supergirl Suit
 * Kal-El's Blanket
 * Green Arrow Suit
 * The Flash Suit
 * Killer Frost Suit
 * CFL Quark Matter
 * Waverider
 * White Canary Suit
 * Firestorm Suit
 * Quantum Splicer
 * Firestorm Matrix
 * Dark Arrow Suit
 * Overgirl Suit
 * Prometheus Suit
 * Reverse-Flash Suit
 * "Guardian Suit"
 * Breach
 * Inter-Dimensional Extrapolator
 * Kara Danvers' Glasses
 * Bows and Arrows
 * Oliver Queen's Bow and Arrow
 * Dark Arrow's Bows and Arrows
 * Heat Gun

Locations

 * Earth-X
 * Earth
 * New Reich
 * Earth-1
 * Earth
 * North America
 * United States of America
 * Star City
 * Bunker
 * Central City
 * S.T.A.R. Labs
 * Pipeline
 * CC Jitters
 * Europe
 * England
 * Earth-38
 * Earth
 * North America
 * United States of America
 * National City
 * DEO National City Headquarters
 * Earth-2