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.

Characters

 * 1) Jor-El
 * 2) Lara Van-El
 * 3) Kal-El/Clark Kent/Superman
 * 4) Zor-El
 * 5) Kara Zor-El/Kara Danvers/Supergirl
 * 6) Alura Zor-El
 * 7) Cat Grant
 * 8) James "Jimmy" Olsen
 * 9) Vartox
 * 10) J'onn J'onzz
 * 11) Maxwell Lord
 * 12) Hellgrammite
 * 13) Gor
 * 14) Mur
 * 15) Ben Krull/Reactron
 * 16) Lucy Lane
 * 17) Leslie Willis/Livewire
 * 18) Hank Henshaw
 * 19) Sam Lane
 * 20) T.O. Morrow
 * 21) Red Tornado
 * 22) Jemm
 * 23) Non
 * 24) Dirk Armstrong
 * 25) Tor
 * 26) Winslow Schott/Toyman *
 * 27) Cameron Chase
 * 28) Adam Grant
 * 29) Bizarro
 * 30) Kelex
 * 31) Siobhan Smythe
 * 32) Draper/Master Jailer
 * 33) Alphonse Luzano
 * 34) Indigo/Brainiac 8

Comic book tie-in characters

 * 1) Rampage ("Chapter 1")

Referenced characters

 * 1) Lois Lane
 * 2) Perry White
 * 3) K'hym J'onzz
 * 4) Rao

Upcoming characters

 * Barry Allen/The Flash

Upcoming comic book tie-in characters

 * Vril Dox ("Chapter 4")
 * Psi ("Chapter 6")

Notes:
 * 1) Even though Winslow is the actual version of Toyman in Supergirl, Winslow "Winn" Schott Jr., who is an original character specifically created for the show, is also based in part on the same character.

Groups

 * 1) D.E.O.
 * 2) Metropolis Metros ("Chapter 1")

Locations

 * 1) Krypton
 * 2) Phantom Zone
 * 3) Fort Rozz
 * 4) Noonan's Bar
 * 5) Opal City
 * 6) Fortress of Solitude

Referenced Locations

 * 1) Daily Planet
 * 2) Metropolis
 * 3) Midvale High
 * 4) Trombus
 * 5) Starhaven
 * 6) Colu

Items

 * 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