Batman: Assault on Arkham

Batman: Assault on Arkham is the fourteenth animated film in the Batman animated film series and is set in the same universe as Rocksteady's Batman: Arkham video game franchise and set two years before Batman: Arkham Asylum.

Scene Summary
When Joker pulled the lever, which was opening all cells of inmates, Poison Ivy was one of them. She was using her plants and hypnotized policemen and inmates of Arkham to escape from Asylum.