Gotham airs Tuesdays on FOX at 8 p.m. ET / 7 p.m. CT.
It seems as if FOX’s Gotham are keen to capitalise on Harley Quinn’s recent surge in popularity prompted by Robbie’s scene-stealing take on the character in last year’s Suicide Squad.
Gotham has a habit of playing fast-and-loose with the mythologies of its characters, so it’s entirely possible.
Stephens also teased that the character would be the “lauching point” for the central plot of season 4; so her first appearance seems like it’ll be pretty dramatic in its nature.