First off Steve being an astronaut made good backstory for future stories in the series. Steve is critically injured in a fighter plane accident and suffers a crushed right arm,
lost legs and damaged left eye. After being given a new zoom
in lense camera eye, a new arm with bulldozer strengh, and strong legs that let him run fast he is ready. Now he has a new job working for Oscar Goldman and the government on secret missions. Steve has to combat aliens, robots,a bionic
saquatch, another bionic man and we are introduced to the love of Steve's life who evetually becomes The Bionic Woman.