One of Gotham's most fearsome reimaginings was the Joker. 1 / 8
Portrayed by Cameron Monaghan, the grinning villain haunted Bruce Wayne since the first season. 2 / 8
Makeup artist Ben Bornstein shared concept art of an unused design for the character. 3 / 8
The character debuted as the unhinged Jerome Valeska. 4 / 8
Jerome would later be killed after uniting Gotham City's villains. 5 / 8
It was revealed that Jerome had a twin brother named Jeremiah, who later became a villain. 6 / 8
Jeremiah resurfaced in the fifth and final season of Gotham. 7 / 8
During the final season, Jeremiah underwent his transformation into the Joker. 8 / 8