Basically the movie is about a cop who gets framed for killing another cop by the mafia. The sub-plot deals with the main character gaining superhuman powers by being exposed to a radioactive explosion. They try to put the cop to death but they can't kill him.
I think the IMDB synopsis really sums it up perfectly:
The policeman Dave Speed is assigned to a mission in an ex-Indian reservation near a military shooting range. Casually, Dave is doing an investigation on the spot. A nuclear missile explodes. The radiation gives him superpowers. Dave is able to move object with the mind force, to discover mysterious crimes and to jump with no problem from a skyscraper. His friends cannot understand those transformations.
What part of "blockbusting, high-flying, water-walking, smooth talking, fleet-footed, sky-diving, hard-driving, crime-fighting, all-American hero" did you not notice while watching it??