On its first mission, the Adaptoid tried to replace Captain America. Believing it had killed him, it went into hibernation in Westchester County. The presence of the X-Men and the Mimic revived it, but when the Mimic tried to copy the Adaptoid's powers, they both lost all their powers.
When the Adaptoid encountered Captain Marvel, it copied his Nega-Bands, thus gaining access to the Negative Zone. Although it lost that battle, it later lured Captain America to the Negative Zone. The Avengers and the Thing captured it and imprisoned it underneath Avengers Mansion.
The Masters of Evil (IV) captured the mansion and accidentally released the Adaptoid. It changed its strategy and collected several other androids (Machine Man, Sentry 459, Dragon Man, Awesome Andy, and Tess One) to form the team Heavy Metal. They attacked the Avengers' Hydrobase, but the Adaptoid's ultimate goal was to find Kubik, another product of a Cosmic Cube, and copy its powers. Almost omnipotent, it battled Captain America but could not overcome his indomitable will. Kubik erased its new powers, removed its Cosmic Cube portion, and sent it back into hibernation.
The Machinesmith briefly revived it.Doctor Doom appropriated the Adaptoid and sent it after the Fantastic Four. At the time the Thing had lost his powers, so the Adaptoid couldn't copy them, but with his mechanical substitutes the Thing made short work of it.
Devlin D'Angelo, a crime boss, bought the Adaptoid and forced Bruce Banner to repair it, apparently unaware of Banner's propensity to become the Hulk. After facing the Hulk, the Adaptoid murdered D'Angelo.
The Adaptoid eventually grew dissatisfied with humanity and left Earth to explore space. It came into contact with the Phalanx and was infected with the transmode virus, made into a Select. The Adaptoid was tasked to track down the current Quasar, Phyla-Vell and assimilate her. However, the Kree evaded the machine, until it caught up to her, massacring a sect of the Priests of Pama. Eventually, the Adaptoid learns that Phyla is searching for the "saviour" of the Kree who would oppose the Phalanx. It managed to trick Phyla into unleashing her quantum energy against it, enabling the Adaptoid to create facsimiles of her quantum bands to follow the trail to the saviour. When the Adaptoid arrived on the planet where the saviour was regenerating, it began to assimilate him. However, the saviour was actively fighting against the machine. Phyla arrived in time and fought the Adaptoid, reabsorbing a portion of the quantum energy that was stolen from her. She played on the Adaptoid's inability to imagine and defeated it.
Mimicry: The Adaptoid can copy the powers, appearance, and equipment of any superpowered being in close proximity to it. It then becomes a duplicate of that being, visually indistinguishable from it. Given the opportunity, it can copy up to eight different beings at one time, combining their attributes in a seemingly random fashion, but all these attributes turn green. The main picture, for instance, shows the Adaptoid with Captain America's shield, Thor's chest medallions, and Iron Man's ribbed armor.
Bereft of the Cosmic Cube fragment that originally gave this android the means to duplicate powers, the means by which it copies superpowers is currently unknown.
The Adaptoid is only capable of copying what it sees. It has limited imagination, incapable of dreaming up complex images. Also, its computer brain cannot cope with cosmic awareness, which would cause an overload.