Although the armor's new tactical abilities made it far more efficient than previous armors, able to evade attacks based on past experience with opponents, its lack of human morality caused it to kill Whiplash in its 'test drive', subsequently becoming increasingly obsessed with merging with Stark so that they would become Iron Man on a permanent basis (on a more practical note, it also suffered from a power supply problem as it ran down its batteries at a far more rapid rate due to the energy required to sustain its sentience). Although it attempted to kill Stark in a final confrontation on a deserted island, when Stark suffered a heart attack, it reverted to its default programming, sacrificing its own central power source to help sustain Stark's heart. It was later salvaged by the 'Sons of Yinsen,' a cult who followed Ho Yinsen to use as a host for Yinsen's brain, only for Ultron to take control of the armor before it was destroyed for good.