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Day 21 - DC Character - Poison Ivy
Poison Ivy
I do not remember Ann Margaret as Poison Ivy, but here she is:

Poison Ivy is a fictional supervillain/anti-hero appearing in comic books published by DC Comics, commonly in association with superhero Batman, created by Robert Kanigher and Sheldon Moldoff. The character made her debut in Batman 181 (June 1966). Her real name is Pamela Lillian Isley (/ˈaɪzli/).
Poison Ivy has been portrayed as a love interest of Batman and is known for her infatuation with him. She is a Gotham City botanist who is obsessed with plants, ecological extinction, and environmentalism. Ivy typically wears a green one-piece outfit adorned with leaves and often has plant vines extending over her limbs. She uses plant toxins and mind-controlling pheromones for her criminal activities, which are usually aimed at protecting endangered species and the natural environment.
Poison Ivy is one of Batman's most enduring enemies, belonging to the collective of adversaries who make up Batman's rogues gallery. She has been featured in many media adaptations related to Batman. Uma Thurman portrayed the character in Batman & Robin, and Clare Foley, Maggie Geha, and Peyton List played her in Gotham. She has also been voiced by Diane Pershing in the DC animated universe, Piera Coppola on The Batman animated series, Tasia Valenza for the Batman: Arkham video game franchise, and Riki Lindhome in The Lego Batman Movie.
Wikipedia has more!
The Comic Vine article has more about Poison Ivy.
I do not remember Ann Margaret as Poison Ivy, but here she is:

Poison Ivy is a fictional supervillain/anti-hero appearing in comic books published by DC Comics, commonly in association with superhero Batman, created by Robert Kanigher and Sheldon Moldoff. The character made her debut in Batman 181 (June 1966). Her real name is Pamela Lillian Isley (/ˈaɪzli/).
Poison Ivy has been portrayed as a love interest of Batman and is known for her infatuation with him. She is a Gotham City botanist who is obsessed with plants, ecological extinction, and environmentalism. Ivy typically wears a green one-piece outfit adorned with leaves and often has plant vines extending over her limbs. She uses plant toxins and mind-controlling pheromones for her criminal activities, which are usually aimed at protecting endangered species and the natural environment.
Poison Ivy is one of Batman's most enduring enemies, belonging to the collective of adversaries who make up Batman's rogues gallery. She has been featured in many media adaptations related to Batman. Uma Thurman portrayed the character in Batman & Robin, and Clare Foley, Maggie Geha, and Peyton List played her in Gotham. She has also been voiced by Diane Pershing in the DC animated universe, Piera Coppola on The Batman animated series, Tasia Valenza for the Batman: Arkham video game franchise, and Riki Lindhome in The Lego Batman Movie.
Wikipedia has more!
The Comic Vine article has more about Poison Ivy.