While Josh was visiting his stepfather at work, a group of enemy agents led by [[Psycho]] attacked the control facilities. During the attack McGrath faces several enemy agents finally fighting the cyborg, but in the midst of the fight, was badly injured and exposed to a swarm of microscopic nanomachines, the entity known as "Nano Tech Max", which penetrate Josh's body and were without power as Josh left to die in order to save Josh's life, his adoptive father, Jefferson Smith, Josh agree to submit to a secret operation that gives a power to from the machines, this saves him and gives him superpowers. As a result, Josh takes on the identity of Max Steel and fight villains with powers, principally Mr. Dread, Psycho, members of the spy organization, and later, mutants, robots, mad scientists and monsters mutants.
After his accident he tried to heal with something known by the company and Nano-Technology Max but it was useless (evidently there is no mention of the fifth isotope Elementium), in that moment passed Dr. Roberto Martinez / Berto (Nano-specialist Max technology) and said that he felt weak because the energy needed Transfásica nanoprobes to survive because if it were starving so he says Josh also needed. Josh agreed to undergo transfásica shock and ran, his life was saved. Nano-Max technology gave him the ability to see and hear the nanoprobes distance and gave the ability to alter their appearance, turn invisible (stealth mode), and to be super-strong ("Turbo Action!") . He used the nanoprobes to assume the appearance of Max Steel, which is very different from Josh McGrath, and join the fight against crime. Josh chose the code name Max Steel for having the Nano-Technology and Max be put on the computer Steel (the most important operations team of the N-Tek). Although he said the series is no longer if Josh McGrath is now Max Steel this is true to the movie The mastery of the elements from which only now appears as Max. His new identity affect his work in extreme sports (by which I had to retire, return, retire, on), academic performance and his relationship with his girlfriend Laura Chen. Maybe the Nano-probes would become his best friend but sometimes it would be his greatest enemy because they are also its weakness because if you do not have Max transfásica energy weakens and may die, the only way was recharged by a generator transfásico circles that revolve around it (like the one shown in the film Countdown) but then developed a mobile generator Berto (like the one featured in the movie endangered). What is also very characteristic of the series is that Max had a plane called the hawk that he used almost every episode and also had the stealth mode like him. Max, Josh is left extreme sports circuit after the movie "endangered". In the movie "Countdown" it says that Max is not as powerful as before and after a laboratory accident, he introduced nanofillers steel, with adrenaline which now would be their power source, the more fought and more excited, would have more power, this was a result of Adrenalink process. However, in the movie "Max Steel Vs The Dark Enemy" Max ends the Adrenalink to bring 150% to beat Extroyer. This results in having to fix your system, and as a result returned to have the Turbo Action. But now is not weakened if it has no load and keeps his athletic skills. In the movie "Max Steel Vs The Mutant Menace", improve your system because it could not beat Toxzon, now has a new Turbo fuel that is 10 times more powerful than the last, also Biolink-Ballolink renew the which now spreads throughout your body when you have the Turbo, creating a new nano-suit that helps him control his new power. By activating the Turbo Action can increase the power of the whole N-Tek arsenal, including vehicles. His charge also lasts longer than before. The Mutant Menace became apparent that if Max had the turbo was in action suit Turbo, but the toxicity was observed Legion can bring without Turbo Action.