Elseworlds, Part 1

Synopsis
When Barry Allen and Oliver Queen wake up one morning and realize they have swapped bodies with each other, the two set off to find out what disturbed the timeline to cause such a shift. However, things quickly go from bad to worse when they present their case to Team Flash and the gang doesn't believe them. Barry and Oliver realize they need Supergirl's help and travel to Smallville on Earth-38 where they end up meeting Kara's cousin, Clark Kent, and intrepid reporter, Lois Lane.

Main Characters

 * The Trinity
 * The Flash/Barry Allen (Oliver Queen)
 * Green Arrow/Oliver Queen (Barry Allen)
 * Supergirl/Kara Danvers (Kara Zor-El)
 * Team Flash
 * Iris West-Allen
 * The Flash/Barry Allen (Oliver Queen)
 * Killer Frost (Caitlin Snow)
 * Cisco Ramon
 * Elongated Man (Ralph Dibny)
 * Harrison Sherloque Wells
 * ARGUS
 * Green Arrow/Oliver Queen (Barry Allen)
 * John Diggle
 * Superman/Clark Kent (Kal-El)
 * Lois Lane
 * Batwoman (Kate Kane)

Villains

 * The Monitor (Mar Novu)
 * John Deegan
 * Cicada
 * AMAZO
 * Bertinelli Crime Family
 * Bratva
 * Ricardo Diaz

Other Characters

 * Earth-90 Vigilante Group
 * "Stargirl"
 * "Hawkgirl"
 * "Huntress"
 * "Hawkman"
 * "Green Arrow"
 * "Captain Cold"
 * "Firestorm"
 * "The Ray"
 * "Jesse Quick"
 * "Obsidian"
 * The Flash (Barry Allen)
 * Frankenstein
 * Captain David Singh
 * Gypsy
 * Wild Dog
 * Felicity Smoak
 * Ray Palmer
 * Tesla
 * Anatoly Knyazev
 * Joe West
 * Nora Allen
 * Henry Allen
 * Cat Grant
 * President Phil Baker
 * Alex Danvers
 * Jonathan Kent
 * Officer Jones
 * Gort
 * God (Earth-1)
 * God (Earth-38)
 * T-3000
 * Sherloque Wells' Third Ex-wife

Teams and Organization

 * Earth-90 Vigilante Group
 * The American Psychiatric Consortium
 * S.T.A.R. Labs
 * Ivo Laboratories
 * CCPD
 * ARGUS
 * Bertinelli Crime Family
 * Bratva
 * Vacuum Service & Parts
 * The Federal Dispatch
 * Slabside Maximum Security Prison
 * FBI
 * High Council of Argo
 * DEO
 * Daily Planet
 * The Trinity
 * Wayne Enterprises

Species

 * Humans (Earth-90)
 * Metahumans (Earth-90)
 * Maltusians (UE-18)
 * Humans (Earth-1)
 * Metahumans (Earth-1)
 * Robots (Earth-1)
 * Artificial Intelligences (Earth-1)
 * Humans (Earth-221)
 * Kryptonians (Earth-38)
 * Humans (Earth-38)
 * Deities (Earth-1)
 * Dogs
 * Cats

Objects

 * "Stargirl Suit"
 * "Hawkgirl Suit"
 * "Huntress Suit"
 * "Hawkman Suit"
 * "Green Arrow Suit (Earth-90)"
 * "Captain Cold Suit"
 * "Firestorm Suit"
 * "The Ray Suit"
 * "Jesse Quick Suit"
 * "Obsidian Suit"
 * The Flash Suit (Earth-90)
 * Quantum Portals
 * Book of Destiny
 * The Monitor Armor
 * Flash Ring
 * The Flash Suit (Earth-1)
 * Bow and Arrow
 * Oliver Queen's Bow and Arrow
 * Green Arrow Suit (Earth-1)
 * Freaky Friday
 * Quantum Leap
 * Inter-Dimensional Extrapolator
 * Stranger Things
 * Breaches
 * CFL Quark Matter
 * Clark Kent's Glasses
 * Kara Danvers' Glasses
 * Elongated Man Suit
 * Killer Frost Suit
 * Mirakuru
 * Superman Suit
 * Supergirl Suit
 * Kal-El's Blanket
 * Green Arrow's Motorcycle
 * Batsuit

Locations

 * Earth-90
 * Earth
 * United States of America
 * Central City
 * Earth-1
 * Earth
 * United States of America
 * Gotham City
 * Wayne Tower
 * Missouri
 * Central City
 * West-Allen Loft
 * S.T.A.R. Labs Central City Facility
 * Pipeline
 * Ivo Laboratories Factory
 * West House
 * Washington
 * Star City
 * ARGUS Headquarters
 * Bunker
 * Slabside Maximum Security Prison
 * Speed Force
 * Earth-38
 * Earth
 * United States of America
 * Kansas
 * Smallville
 * Kent Farm
 * Kent Barn
 * Metropolis
 * Krypton
 * Argo City

Trivia

 * The episode was previously titled "Elseworlds: Hour One".