Helen Cho

"The regeneration cradle prints tissue, it can’t build a living body." "It can, you can. You lacked the materials. You’re a brilliant woman, Helen."

- Helen Cho and Ultron

Doctor Helen Cho is a world-renowned geneticist and an ally of the Avengers. She was called to Avengers Tower to assist the Avengers with her research and technology in the war against HYDRA. She also co-created Vision while under Ultron's mind control.

Working with the Avengers
"The nano-molecular functionality is instantaneous. His cells don’t know they’re bonding with simulacrum." "She is creating tissue."

- Helen Cho and Bruce Banner

Cho was called to Avengers Tower by Tony Stark after Clint Barton was injured in a battle against HYDRA and Baron Wolfgang von Strucker. She was invited to set up her equipment in Bruce Banner's lab, where she had worked before, and awaited the Avengers arrival alongside Maria Hill. Once the Avengers arrived, Cho quickly addressed Barton's injuries and had him moved into the lab.

Cho used a machine called the Cradle to rebuild Clint Barton's damaged skin, saving his life in mere minutes. Once Barton was stable and joking about living forever, Cho explained how the machine worked, greatly impressing Bruce Banner and the others watching. When Cho suggested that Barton's own girlfriend wouldn't be able to tell the difference, Barton insisted he did not have a girlfriend. Tony Stark later invited Cho 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.

Celebration
"I expect to see you at the party on Saturday." "Unlike you, I don’t have a lot of time for parties. Will Thor be there?"

- Tony Stark and Helen Cho

Ultron interrupted the party; Cho found a place to hide during the Attack on Avengers Tower. When a corrupted Iron Legion drone attempted to kill Cho, Ultron signaled for it not to fire and spared her life.

Creating Vision
"The Vibranium atoms aren’t just compatible with the tissue cells, they’re binding them. And S.H.I.E.L.D. never even thought…" "The most versatile substance on the planet and they used it to make a Frisbee."

- Helen Cho and Ultron

When Cho returned to 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, foreseeing her usefulness in his future plans, and threatened to kill her work staff if she alerted them. Ultron then used Loki's Scepter on her to control her.

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 the hypnosis so that she could stop him. Cho recovered her senses and proceeded to disconnect Ultron from the uplink. She was consequently shot with a concussive blast by Ultron.

Captain America later entered the facility and she told him about Ultron's plan to use the Cradle.

Back in the Field
She survived Ultron's blast and her work gave birth to the Vision, a powerful robot with the mind of J.A.R.V.I.S. who helped the Avengers destroy Ultron forever. Due to her continued impressive work for the Avengers, Cho was invited to work with the Avengers at their New Avengers Facility. She and Maria Hill toured through the new labourites filled with her team of scientists.

Personality
Cho seems to be a very polite and friendly character. She is selfless; having built the Cradle which has the potential to save millions of lives. She has also displayed high levels of courage and quick thinking as shown when she immediately stopped the download of Ultron's programming into the Vision after being freed from his control. She seems to be upbeat and have a very motivated nature. She doesn't seem to be particularly sociable, declining her invitation to the party and only changing her mind when she discovered that Thor would be in attendance. Whilst under the control of the Mind Stone, Cho appears to be enthusiastic towards helping Ultron and was keen to experiment to create Vision.

Abilities

 * Genius-Level Intellect: Cho possesses a genius-level intellect, being a geneticist renowned across the world. Her intellect rivaled that of Tony Stark and Bruce Banner.
 * 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 she could have been 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 and other gadgetry useful to the Avengers.
 * Multilingual: Cho speaks fluent English and Korean.

Allies

 * Avengers
 * Tony Stark/Iron Man - Old Friend
 * Steve Rogers/Captain America
 * Thor - Crush
 * Bruce Banner/Hulk
 * Clint Barton/Hawkeye
 * Natasha Romanoff/Black Widow
 * Vision - Co-Creation
 * Pietro Maximoff/Quicksilver † - Enemy turned Ally
 * Wanda Maximoff/Scarlet Witch - Enemy turned Ally and Liberator
 * James Rhodes/War Machine
 * Sam Wilson/Falcon
 * Nick Fury
 * Maria Hill
 * Erik Selvig - Colleague

Enemies

 * Ultron †

Trivia

 * In the comics, Helen Cho is the mother of Amadeus Cho. Amadeus appeared in The Incredible Hulk but seems to have no connection to Helen.
 * Cho has a crush on Thor, as she attended Tony Stark's party mainly to see him.