Harley Quinn
Lovers' Quarrel
S2 E12:
Darkseid will grant Psycho the world if Psycho can prove himself by bringing him the head of Harley Quinn, the earth woman who absconded with his army without making good on her end of the deal. Psycho manages to control Ivy’s mind, which results in the Justice League fighting Ivy, and the ultimate showdown: Ivy vs. Harley!