Everett K. Ross, special attaché for the U.S. State Department (and no apparent relation to Betty), awoke one day to find himself mystically transformed into the body of Mephisto. Turning for help, Ross arrived on the doorstep of Dr. Strange (Black Panther #34).
To his surprise, however, Ross was greeted (er, attacked) by the entire non-team from Defenders (Volume 2). Although Ross easily identified Hulk and Namor, he had trouble remembering the correct names for Valkyrie, Hellcat, Nighthawk, and even Dr. Strangemuch less Silver Surfer.
As Ross explained that he wasn't really Mephisto, Dr. Strange sensed a spirit force that reminded him of Iron Fist. Just then, a mysterious figure impersonating Ross arrived on the scene and defeated everyone (Black Panther #35). The culprit responsible for the ruse was none other than Chiantang (a.k.a. the Black Dragon), an old enemy of Power Man and Iron Fist.
Not long afterward, Chiantang created a mystic imbalance within Iron Fist that set the hero into battle against Black Panther. (#39). Under this diabolical influence, the green portions of Iron Fist's costumed turned reda visual phenomenon that harked back to Black Dragon's first attempt to corrupt Iron Fist (Power Man and Iron Fist #119).