- "You know who was a great villain? The Joker!"
- āAlice to Roman Sionis[src]
Joker refers to several characters in the multiverse:
- For the criminal from Earth-1/Earth-Prime, see Jack Napier.
- For the criminal from Earth-89, see Joker (Earth-89).
- For the criminal from Earth-96, see Joker (Earth-96).
- For the criminal from Earth-203, see Joker (Earth-203).