How bad is it? It might be the worst superhero film of the 1970's.
Should you see it? No - it just doesn't have enough going for it.
A year after "Superman," this film, based on the same idea of a superhero from outer space with special powers (in this case, speed) fighting crime, was made in Spain. The bad guy is Cameron Mitchell, who plays yet another mad doctor intent on world conquest. It's unbelievably cheap and has little originality.