 A figure more legendary than that of the Mahdi, the evaded savior, has not been seen in the history of mankind. The threads of the world events have woven many a fine design in human life, but the pattern of the Mahdi stands high above every other pattern. He has been the vision of the visionaries in history. He has been the dream of all the dreamers of the world. For the ultimate salvation of mankind, he is the pole star of hope and which the gaze of humanity has fixed. The Quranic prophecy of the inevitable victory of Islam will be realized following the advent of the Mahdi, who will fight the wrong, remedy the evils and establish devolved order based on the Islamic teachings of justice and virtue. Thereafter, there will be only one religion and one government in the world. It may be mentioned here that the movement for the establishment of the world government is already afoot and this point is engaging the attention of many prominent intellectuals. The setting of the United Nations is a step in this direction. In spite of the growing consciousness of its desirability, the unification of the world is still a distant dream. The vested interests and the mutual revolaries of the regimes in the various countries and the mutual animosities of the divergent blocks constitute a big hurdle in the view of its materialization. Hence, its consumption cannot be expected to come off automatically. It will need the activist struggle of a world performer in the person of Mahdi anyhow as thought has been made and as things are gradually turning out exactly as predicted by Islam 14 centuries ago. The belief in an expected reformer and a saviour of humanity is not peculiar to the Shia school of Islam. It is common not only to the Muslim sects but is also shared with all the great religions such as Christianity, Judaism, Buddhism and Zoroastrianism and this quest for the truth about the Mahdi there is no distinction of any caste, creed or country. The quest is universal exactly in the same way as the Mahdi himself is universal. He stands resplendent high above the narrow walls in which humanity is cut up and divided. He belongs to everybody for all that and much more. What exactly is the Mahdi surely that is the big question which is thinking people all over the world would like to ask.