Injustice 2 - Chapter 2 - The laughing girl

That night Harley Quinn, Green Arrow and Black Canary infiltrated the swamp slaughterhouse, where they spotted a group of men led by Deadshot who were preparing the shipment of Fear Gas. Suddenly the three fell into a trap prepared by Poison Ivy, which was very glad to see Harley, but refused to help them since Gorilla Grodd had promised her to respect nature, something that neither Batman nor Superman had ever done. Harley got out of the trap and faced Pamela.

When Poison Ivy fell defeated, Harley went to help Oliver and Dinah, but the Scarecrow managed to spray her with a new formula of the Fear Gas that made Harley see him as a giant monster. Although she managed to defeat Crane, he did not give up and sprayed her again with his new toxin. Harley fell consumed with hallucinations and everything around her became like a macabre amusement park. There she met up with the Joker, who tried to make her sadistic killer side up again. However, when Harley refused, the Joker attacked without any mercy until he got defeated.

Once Harley regained consciousness, it was just in time to see Oliver firing arrows at his enemies' sliders to prevent them from running away with the cargo. Unfortunately, the explosions caught the attention of Swamp Thing, who attacked them furiously for causing problems in his swamp. When Green Arrow and Black Canary fell, Harley had to fight the green monster. When he managed to beat him, Harley explained that they were there to prevent villains from continuing to pour toxic substances into the swamp. Upon learning that, Swamp Thing attacked the Scarecrow men, but failed to prevent him from escaping. Before leaving Swamp Thing promised to help them again only if their interests were the same.

In the space, Kara Zor-El, now Supergirl, observed the magnificence of the world before returning to her hiding place in Kahndaq, where Wonder Woman and Black Adam were guarding her. Kara was frustrated because she could not go out into the outside world to help people in need with her new powers. Diana warned him that it was very dangerous to leave because Batman shouldn't know of his existence until the right time. To calm his frustration, she was promised that they would soon release Kal and make Batman pay for all his crimes. On the other hand, Harley Quinn, Green Arrow and Black Canary were heading to Gorilla City with the aim of defeating Grodd and ending the Society.