Crisis on Infinite Earths: Part One

The episode is the first part of the five-part crossover,.

Synopsis
The Monitor sends Harbinger to gather the worlds' greatest heroes - Supergirl, The Flash, Green Arrow, Batwoman, White Canary, The Atom and Superman - in preparation for the impending Crisis. With their worlds in imminent danger, the superheroes suit up for battle while J'onn and Alex recruit Lena to help them find a way to save the people of Earth-38.ref>

Protagonists

 * The Monitor (Mar Novu)
 * Team Flash
 * The Flash (Barry Allen)
 * Team Arrow
 * Green Arrow (Oliver Queen)
 * Blackstar (Mia Smoak)
 * Harbinger (Lyla Michaels)
 * Freedom Fighters
 * The Ray (Ray Terrill)
 * Super Friends
 * Supergirl (Kara Zor-El)
 * John Jones (J'onn J'onzz)
 * Alex Danvers
 * Brainiac 5 (Querl Dox)
 * Dreamer (Nia Nal)
 * Guardian (Kelly Olsen)
 * Batwoman (Kate Kane)
 * Legends
 * White Canary (Sara Lance)
 * The Atom (Ray Palmer)
 * Superman/Clark Kent (Kal-El)
 * Lois Lane
 * Alura Zor-El
 * Lena Luthor
 * Green Arrow (Oliver Queen) (Earth-16)
 * Pariah (Harrison Nash Wells)

Antagonists

 * Dominators
 * Red Tornado
 * Lex Luthor
 * Magical Fugitives
 * Tagumo
 * Superman (John Deegan)
 * AMAZO
 * Metallo
 * Joker
 * Malefic J'onzz
 * Doomsday
 * General Zod
 * Wonderland Gang
 * Rabbits
 * Alice
 * Anti-Monitor
 * Shadow Demons
 * Eve Teschmacher

Other Characters

 * Batman
 * Alexander Knox
 * Titans
 * Hawk (Hank Hall)
 * Robin (Jason Todd)
 * Dick Grayson
 * Doomsday Protestor
 * Spike
 * Alana
 * Jonathan Kent
 * Robert Queen
 * Shado
 * Taiana Venediktov
 * Team Flash
 * Cisco Ramon
 * Iris West-Allen
 * Trivia Host
 * Janis Joplin
 * Plastino
 * Jor-El
 * Lara Van-El
 * Zor-El
 * Felicity Smoak
 * William Clayton

Teams and Organizations

 * S.T.A.R. Labs
 * Freedom Fighters
 * Flight 237
 * Arkham Asylum
 * Magical Fugitives
 * Civic Hotel
 * CCPD
 * City Hall (Central City)
 * Gotham City Gazette
 * Titans
 * CatCo Worldwide Media
 * DEO
 * Leviathan
 * USGS
 * Argo City
 * House of El
 * A.R.G.U.S.
 * Wonderland Gang
 * Rabbits
 * The Strange Visitors
 * L-Corp
 * Claymore
 * The Legion

Species

 * Maltusians
 * Humans (Earth-1)
 * Metahumans (Earth-1)
 * Dominators (Earth-1)
 * Robots (Earth-X)
 * A.I. (Earth-X)
 * Kryptonians (Earth-38)
 * Green Martians (Earth-38)
 * Robots (Earth-1)
 * A.I. (Earth-1)
 * Humans (Earth-89)
 * Humans (Earth-9)
 * Humans (Earth-66)
 * Dogs
 * Humans (Earth-38)
 * Dracokardosians/Dragons/Lizards (Earth-38)
 * Coluans (Earth-38)
 * Kryptonian-Human Hybrids (Earth-38)
 * Human-Naltorian Hybrids (Earth-38)
 * Flackurians (Earth-38)
 * Shadow Demons)
 * Cat
 * Daxamites (Earth-38)

Objects

 * The Flash Suits
 * Dominator Dropship
 * Green Arrow Suits
 * Mia Smoak's Suit
 * Bow and Arrow
 * Oliver Queen's Bow and Arrow
 * Oliver Queen (Earth-16)'s Bow and Arrow
 * The Ray Suit
 * Batsuit
 * Utility Belt
 * Lexosuit
 * Supergirl Suits
 * Kal-El's Blanket
 * ATOM Exosuit
 * Dwarf Star
 * Shrink Ray
 * Superman Suit
 * Superman Suit (Earth-1)
 * Solar Hammer
 * Batsignal (Earth-89)
 * Batsuit (Earth-89)
 * Hawk Suit
 * Robin Suit
 * Antimatter
 * DEO Protective Suit
 * Image Inducer
 * Legion Rings
 * Laser Guns
 * Book of Destiny
 * Brainiac 5's Algorithm
 * Harun-El
 * Holograms
 * Jonathan Kent's Pod
 * Harbinger Suit
 * Batsignal (Earth-1)
 * Rabbit Masks
 * Battech
 * Grappling Gun
 * Little Robot Man
 * Mercedes Benz
 * Quantum Towers
 * White Canary Suit
 * Breaches
 * CFL Quark Matter
 * The Legion Cruiser
 * TX-B1-250
 * Inter-Dimensional Extrapolator
 * Myriad
 * The Monitor Armor
 * Claymore Satellite
 * Green Arrow Suit (Earth-16)
 * Bo-Staff
 * Gambit (Earth-16)
 * Batarangs
 * Dreamer Suit
 * Guardian Suit
 * Pariah Suit

Locations

 * Earth-1
 * Earth
 * United States of America
 * Washington
 * Star City
 * Bunker
 * Missouri
 * Central City
 * S.T.A.R. Labs
 * Civic Hotel
 * City Hall
 * Gotham City
 * Arkham Asylum
 * Wonderland Gang Sugar Factory
 * Woodstock
 * Japan
 * Tokyo
 * Ishirō Honda's Studio
 * Lian Yu
 * A.R.G.U.S. Camp
 * Earth-X
 * Earth
 * Earth-38
 * Earth
 * United States of America
 * California
 * National City
 * Shelley Island
 * CatCo Plaza
 * DEO HQ
 * L-Corp Office
 * Lena Luthor's Lab
 * Kansas
 * Argo City
 * Krypton
 * Mars
 * Earth-89
 * Earth
 * United States of America
 * New Jersey
 * Gotham City
 * Earth-9
 * Earth
 * United States of America
 * San Francisco
 * Port of San Francisco
 * Titans Tower
 * Earth-66
 * Earth
 * United States of America
 * Gotham City
 * Earth-2
 * Earth-16
 * Earth
 * United States of America
 * Star City
 * Bunker
 * Lian Yu