Phase IV is for me one of the biggest surprises of the year 1974. I will grant that my expectations were very low before watching Phase IV. It's probably the most known Horror movie and it's really entertaining. Anyway, Sci-Fi may boast of one of the biggest numbers of good movies. What determines the phenomenon of this movie? It's realism, taking care of psychological probability?. Phase IV is one of the best possible choice for a saturday evening with cinema.