Although the show has thus far stopped short of explicitly calling Jeremiah The Joker, the trailer makes it abundantly clear that this is the direction Gotham is heading as it rockets towards its season 4 finale.
The character of Jerome took on more and more Jokerisms with each Gotham appearance but the show’s fourth season revealed that the identity of The Joker is actually Jerome’s twin brother Jeremiah.
The Joker is finally coming to Gotham in a new trailer for this week’s episode, “That Old Corpse.”
The trailer ends with the ominous promise of “he’s coming” in a telling purple and green color-scheme.