Mary Hamilton (Earth-1: Pre-Crisis)

"With one more saved life, one more cancer-free scan, one more smile because if we can do that every day, together, we can leave this world a better place than how we found it."

- Dr. Mary Hamilton, M.D.

Dr. Mary Hamilton, M.D. is a medical student and the owner of a secret clinic in Gotham City. Mary is also the daughter of Catherine Hamilton-Kane and the step-daughter of Jacob Kane, and the step-sister of Kate Kane.

Suspecting her step-sister's secret actions, Mary investigated her and discovered that Kate Kane is Batwoman. Mary immediately joined the Bat Team as its medic and assisted Luke Fox in Batwoman's operations in Gotham. However, Kate was caught in a plane accident and was presumed deceased by many, Mary then worked with Ryan Wilder, who stumbled across the Batsuit and witnessed the accident by the beach.

Months later, Mary, Ryan and Luke worked together in search of Batman's missing trophies who were stolen by a brainwashed Kate Kane. In the process, Mary was kidnapped by Poison Ivy and was infected by one of her vines, slowly converting her behaviors into that of Pemela Isley. Mary's infection caught Alice's attention and intentionally triggered Mary's transformation into the Poison Ivy, before working together to escape Gotham City.

Former Powers

 * Transformation: After being kidnapped and infected by Poison Ivy, Mary started growing a fascination over plants and developed a rash on her forearm. Her infection then worsened and gave her the abilities of the original Poison Ivy, allowing her to transform into a powerful Metahuman under exposure to sunlight.
 * Chlorokinesis: Mary has the ability to control plants according to her will. She was also able to summon roots of countless plants from the ground and tangle Batwoman with them.
 * Hypnotism: Mary has the ability to hypnotize individuals.
 * Sporeling Transference: After being desiccated for 10 years, Pamela Isley was forced to absorb the power from Mary to regain her strength.
 * Healing Blood: Mary was cured from Alice's poison with the Desert Rose, briefly giving her the ability to heal any form of diseases through blood transfusion.

Abilities

 * High-level Intellect: Mary possesses an exceptional intelligence and was able to study complex medical concepts.
 * Medical Knowledge: Mary studied at Gotham University Medical School and learnt different medical knowledge that she utilized to treat patients all over Gotham City.

Former Equipment

 * Poison Ivy Suit: After fully transforming into Poison Ivy, Mary began utilizing a green protective.
 * Laser Saw: Mary briefly used the Laser Saw in order to rescue Batwoman from a chain of locks.

Trivia

 * Mary owns a Porsche car licensed 2R7-6W5.