Kerwin Korman was a criminal scientist in the employ of A.I.M. Alongside the Scorpion, he battled Ms. Marvel in the guise of the Destructor, wearing a battlesuit of his own design, but was defeated. Attempting to escape from A.I.M, who wanted to punish him for his failure, he fled to a cavern containing a lost outpost of the alien Kree where Ms. Marvel was battling the robot called the Doomsday Man. Opening a box left behind by the Kree during the course of the battle, Korman was blinded (temporarily, as it turned out) and, firing blindly, caused a cave in which seemingly killed him.
In fact, the Kree technology bonded Korman with the Doomsday Man, which eventually came into A.I.M's possession. They effectively used Korman as a living power source until he eventually escaped and encountered the Avengers. The out-of-control Doomsday Man battled the Avengers, who defeated it and discovered Korman's presence inside the robot but were unable to safely disengage him from it (it appeared that by this point, Kronton's limbs had been removed in order to better facilitate his merger with the robot, and he was also now completely bald). Retrieved by A.I.M, Korman (as the Doomsday Man) escaped once more and went on a further rampage until confronted by his old foe Ms. Marvel, who forcibly removed him from the robot. Korman thanked her, then passed out.