Aaron L said:Tetsuo shed his humanity, transcendant, as has been said. He went as far beyond humanity as we are beyond ameoba, but he couldn't control his power, and he stopped taking the drugs the government gave him that suppressed that power. The 3 other test subjects called on Akira, who had undergone the same problem, and he came back to take Tesua with him. I always assumed that Akira took Tetsuo to teach him, but I have never read the manga. I probably should.