Colleen Wing is a martial arts expert who had became a loyal soldier of the Hand having been recruited by Bakuto. While running her own dojo within New York City, she helped Danny Rand to adapt upon his return and gained his trust while he sought answers about his own company's role with the heroin trade within New York. After capturing Madame Gao, Wing's true allegiance to the Hand was then revealed, forcing her to choose between her loyalties to her fellow soldiers and Rand. Wing chose Rand and helped him to escape, later defeating Bakuto in combat and helping Rand to kill Harold Meachum. With their mission now complete, Rand invited Wing to return to K'un-Lun with him, only for them to discover it had been attacked and seemingly destroyed while Rand was away.
Wing assisted Rand with tracking down the Hand searching for answers, encountering Elektra and a mystery they could not understand. Having also encountered Stick, Wing then witnessed the formation of the Defenders who took on the Hand, with Wing also discovering that Bakuto had returned from the dead to help lead the Hand. Wing continued aiding the Defenders, destroying the Hand's own base of operations and killing Bakuto once and for all. Grateful to Detective Misty Knight for her sacrifice in saving her life, Wing helped her to get a new Prosthetic Arm to replace the one Bakuto had cut off during their fight and helped Knight to get used to it.
As Wing gave up her investment into helping others, she decided to help Rand let his vigilante life to take upon stopping the Triad War that is upon taking over New York. However, Wing had tried to get Rand back into recovery, she gathered the necessary tools to recreate the ritual in order to steal the Iron Fist back from Davos. As Rand had gone back on his feet, he proposed to Wing to take the power of the fist, but reluctantly refused. After Davos' henchmen killed BB, Wing decided to let Iron Fist transfer into her after Davos was incapacitated. Despite Davos' attempt to keep his new power, Wing eventually defeated him and took on the title of Iron Fist during Rand's temporary absence.
