The theory of magnetic monopoles and its importance for Big Bang Cosmology and Grand Unification Theory are reviewed. Although indications existed that Bias Cabrera detected evidence of magnetic monopoles at Stanford in 1982, all efforts to replicate his research have so far failed. Currently no valid explanation exists as to why this important plank in Big Bang Cosmology has not been experimentally verified in spite of over a decade of sophisticated experiments. This area is a major "missing link" which argues against the evolution of matter and the four forces, and also the current big bang world view. The history of the efforts to detect magnetic monopoles are reviewed, and the reasons behind their need for big bang cosmology was discussed.
