Helen Cho

Doctor Helen Cho is a world-renowned geneticist and an ally of the Avengers. From her offices in Seoul, South Korea to sharing workspace with Bruce Banner in his lab at Avengers Tower, Dr. Cho’s research and technology help keep the Avengers in the fight.

Working with the Avengers
Doctor Helen Cho was called to Avengers Tower by Tony Stark when Clint Barton was injured in a battle with HYDRA. She used a machine called the Cradle to rebuild his damaged skin, saving his life. Stark later invited her to a party the team was having to celebrate their victory. At first she declined but changed her mind when she learned that Thor would be attending. Cho was in attendance at the party the Avengers were having when Ultron interrupted. Ultron was about to kill her, but decided not to as he realized her future potential in his plans.

Creating Vision
As she arrived back at her lab in Seoul, Ultron was waiting for her with Scarlet Witch and Quicksilver. He explained to her the reason why he spared her life at the party, and threatened her work staff if she did not help him. Ultron then hypnotized her by using The Scepter. She assisted Ultron in building a human like body for him using her technology from the Cradle. When Scarlet Witch saw what Ultron's main goal was, she freed Cho from hypnosis. When Cho proceeded to disconnect Ultron from the cradle uplink, she was shot by Ultron. She would later tell Captain America about Ultron's plan to use the Cradle.

Back in the Field
She was later at the New Avengers Facility, working as a scientist permanently alongside the Avengers once again.

Personality
Cho seems to have a very motivated nature. She is self motivated as to keep improving The Cradle, which could save millions of lives. She seems upbeat and works with a smile, even despite seemingly not initially sociable, by preferring going back to her lab, instead of attending a party.

Abilities

 * Master Scientist: Cho is an excellent scientist, having created the Cradle, a machine that can regenerate skin tissue, something that amazed even the likes of Bruce Banner. Ultron kept Cho alive when he realized how important Cho can be to his plans. She also co-created Vision, Ultron's desired body who ultimately became an Avenger.
 * Master Physician: Cho is an excellent physician, creating the Cradle, which regenerates skin tissue.
 * Multilingual: Cho speaks fluent English and Korean.

Allies

 * Avengers
 * Tony Stark/Iron Man - Old Friend
 * Steve Rogers/Captain America
 * Thor
 * Bruce Banner/Hulk
 * Clint Barton/Hawkeye
 * Natasha Romanoff/Black Widow
 * Vision - Co-creation
 * Maria Hill
 * James Rhodes/War Machine

Enemies

 * Ultron

Trivia

 * In the comics, Helen Cho is the mother of Amadeus Cho.
 * She seemingly has a crush on Thor, as she attended Tony Stark's party mainly to see him.