Below is a list of characters, locations, etc., which originally appear in the DC Comics and other media prior to the episode's airing, by appearance.
Allusions to the comics
- Main article: Characters from the DC comics
- 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.
- In the comics, the company is also known as Kord, Inc. and Kord Enterprises.
Concepts first appearing in The Flash:
- Firestorm Matrix ("Fallout")
- Speed Force ("Fast Enough")
- Speed Equation ("Flash Back")
- Flashpoint ("Flashpoint")
Concepts first appearing in Constantine:
Allusions to other media
Characters first appearing in The Flash:
Characters first appearing in Supergirl:
Companies, corporations and businesses first appearing in Supergirl:
Items first appearing in Supergirl: