Allusions to the DC Universe

Below is a list of characters, locations, etc., which originally appear in the DC Comics multiverse prior to the episode's airing, by appearance.

Species
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The Flash
Species first appearing in The Flash:
 * 1) Dominators

Supergirl
Species first appearing in Supergirl:
 * 1) Kryptonians
 * 2) Valeronians
 * 3) Martians
 * 4) Green Martians
 * 5) White Martians
 * 6) Saturnians
 * 7) Klarmarians/Faceless Hunters (mentioned only)
 * 8) Starhavenites
 * 9) Coluans
 * 10) K'hunds
 * 11) Almeracians
 * 12) Kigori
 * 13) Daxamite

DC's Legends of Tomorrow
Species first appearing in DC's Legends of Tomorrow: }}
 * 1) Manhawks
 * 2) Thanagarians

Groups
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Arrow
Groups and organizations first appearing in Arrow:
 * 1) SCPD
 * 2) Team Arrow
 * 3) Royal Flush Gang
 * 4) Bertinelli crime family
 * 5) A.R.G.U.S.
 * 6) League of Assassins
 * 7) Church of Blood
 * 8) H.I.V.E.
 * 9) Task Force X/Suicide Squad
 * 10) Brother Eye
 * 11) Demolition Team

Comic book tie-in groups

 * 1) Onslaught
 * 2) Renegades

Referenced groups

 * 1) Star City Rockets
 * 2) Central City Diamonds

The Flash
Groups and organizations first appearing in The Flash:
 * 1) CCPD
 * 2) The Rogues

Comic book tie-in groups

 * 1) Central City Cougars

Referenced groups

 * 1) KCPD

Constantine
Groups and organizations first appearing in Constantine:

Referenced groups

 * 1) Newcastle Crew
 * 2) Mucous Membrane

Supergirl
Groups and organizations first appearing in Supergirl:
 * 1) D.E.O.

Referenced groups

 * 1) Intergang

Comic book tie-in groups

 * 1) Metropolis Metros ("Chapter 1")

DC's Legends of Tomorrow
Groups and organizations first appearing in DC's Legends of Tomorrow: }}
 * 1) Time Masters
 * 2) Justice Society of America

Companies
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Arrow
Companies, corporations and businesses first appearing in Arrow:
 * 1) Channel 52
 * 2) Big Belly Burger
 * 3) Queen Consolidated *
 * 4) Blackhawk Squadron
 * 5) Ferris Air
 * 6) Sherwood Florist
 * 7) St. Roch University

Comic book tie-in companies

 * 1) Kord Industries *

Referenced companies

 * 1) Stellmoor International
 * 2) Oblivion Bar
 * 3) Amertek Industries

The Flash
Companies, corporations and businesses first appearing in The Flash:
 * 1) S.T.A.R. Labs
 * 2) Jitters
 * 3) Stagg Industries
 * 4) Concordance Research
 * 5) Picture News
 * 6) Rathaway Industries
 * 7) Hudson University

Referenced companies
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 * 1) Wayne Tech

Notes:
 * 1) In the comics, the company is known as Queen Industries or Queen Enterprises. It has been teased that in the future, it will be renamed as Queen Inc.
 * 2) In the comics, the company is also known as Kord, Inc. and Kord Enterprises.

Locations
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Arrow
Locations first appearing in Arrow:
 * 1) Earth One
 * 2) Star City
 * 3) The Glades
 * 4) Arrowcave
 * 5) Keystone City
 * 6) Iron Heights
 * 7) Blüdhaven
 * 8) Central City
 * 9) Kahndaq
 * 10) Markovia
 * 11) Corto Maltese
 * 12) Nanda Parbat
 * 13) Lazarus Pit
 * 14) Kasnia
 * 15) Monument Point
 * 16) Ivy Town
 * 17) Pennytown
 * 18) Hub City

Comic book tie-in locations

 * 1) Shiruta

Referenced locations

 * 1) Bialya
 * 2) Calvin City
 * 3) Qurac
 * 4) Belle Reve
 * 5) Opal City

The Flash
Locations first appearing in The Flash:
 * 1) Inglewood
 * 2) Coast City
 * 3) Flash Museum
 * 4) Earth Two
 * 5) Gorilla City
 * 6) Ace Chemical Processing Plant
 * 7) Hall of Justice
 * 8) Earth Three

Referenced locations

 * 1) Midway City
 * 2) Blackgate Penitentiary
 * 3) Atlantis
 * 4) Earth Seventeen
 * 5) Earth Nineteen
 * 6) Earth Thirty-Eight

Constantine
Locations first appearing in Constantine:
 * 1) Ravenscar

Vixen
Locations first appearing in Vixen:
 * 1) Zambesi
 * 2) M'Changa Province

Supergirl
Locations first appearing in Supergirl:
 * 1) Krypton
 * 2) Phantom Zone
 * 3) Midvale
 * 4) Fort Rozz
 * 5) Noonan's Bar
 * 6) Fortress of Solitude
 * 7) Midvale Junior High School
 * 8) Metropolis
 * 9) Daily Planet
 * 10) LexCorp
 * 11) Project Cadmus
 * 12) Mount Pride Observatory
 * 13) Daxam

Referenced locations

 * 1) Trombus
 * 2) Starhaven
 * 3) Colu
 * 4) Gotham City

Comic book tie-in locations

 * 1) Hammersmith Tower ("Chapter 6")
 * 2) Barrio III ("Chapter 10")
 * 3) Stanhope College ("Chapter 11")

DC's Legends of Tomorrow
Locations first appearing in DC's Legends of Tomorrow: }}
 * 1) St. Roch
 * 2) Vanishing Point
 * 3) Ivy University
 * 4) Salvation
 * 5) JSA headquarters

Items
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Arrow
Items first appearing in Arrow:
 * 1) Trick arrows
 * 2) Canary Cry Bomb
 * 3) Soultaker Sword
 * 4) Lazarus Pit
 * 5) O.M.A.C.
 * 6) Black Canary's Motorcycle
 * 7) T-Spheres
 * 8) Nth metal
 * 9) Suit of Souls

The Flash
Items first appearing in The Flash:
 * 1) Cosmic Treadmill
 * 2) Cold Gun
 * 3) Heat Gun
 * 4) Reverse-Flash ring
 * 5) Weather Wand
 * 6) Time Sphere
 * 7) Helmet of Hermes
 * 8) Legion flight ring
 * 9) Velocity 9
 * 10) Promethium
 * 11) Speed Equation
 * 12) Philosopher's Stone

Referenced items

 * 1) Mirror Gun

Constantine
Items first appearing in Constantine:
 * 1) Black Diamond
 * 2) Helmet of Fate
 * 3) Ibistick
 * 4) Medusa Mask
 * 5) Pandora's Box
 * 6) Ace of Winchesters
 * 7) Ring of Solomon
 * 8) Sword of Night

Vixen
Items first appearing in Vixen:
 * 1) Tantu Totem

Supergirl
Items first appearing in Supergirl:
 * 1) Superman's rocket
 * 2) Supegirl's rocket
 * 3) Supergirl suit
 * 4) Green Kryptonite
 * 5) Reactron suit
 * 6) Jimmy Olsen's Signal watch
 * 7) Blue Kryptonite
 * 8) Black Mercy
 * 9) Dwarf Star Key of the Fortress
 * 10) Legion flight ring
 * 11) Red Kryptonite
 * 12) Chocos

Comic book tie-in items

 * 1) Inertron ("Chapter 3")
 * 2) Sunstone ("Chapter 8")

DC's Legends of Tomorrow
Items first appearing in DC's Legends of Tomorrow:
 * 1) Hawkgirl's mace
 * 2) Sgt. Rock's helmet
 * 3) Cosmic Staff
 * 4) Bucket helmet
 * 5) Gene Bomb

Referenced items
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 * 1) Spear of Destiny