Powers: A skilled brainwasher. Employed the Psychotron device for such purposes.
Bio: Dr. Yen worked with the Chinese Red Army in an attempt to brainwash the Black Widow (Natasha Romanova) and have her work against the Avengers. After the initial influence wore off, he exposed her to the Psychotron, a device apparently of his own design that subjected the victim to hallucinations in order to weaken the mind. He is highly nonplussed when the device failed to work very well against her.
Notes: The Psychotron is later put to use by the Hate Monger, who finds plans for the device, and builds his own version.