When young Matt Murdock saved a blind pedestrian from a crashing truck, a radioactive isotope spilled onto him from the vehicle. The substance blinded Matt, but he soon found that his other senses were amplified to superhuman levels. He also manifested a "radar sense" that allowed him to visualize his surroundings without relying on sight.
As he grew up, Matt received training from the ninja master Stick. He later earned a law degree and opened an office with his friend Foggy Nelson, defending those unjustly accused of crimes. By night, he protects his home neighborhood of Hell's Kitchen from criminals and super-villains. Despite living through more personal tragedies than any man should be able to endure, Matt retains an optimistic, heroic outlook on life.