Sincethe word 'Imam" could be misleading under these circumstances. As the Imami Shia believe that Allah(عزّ وجلّ) appointed HIS(عزّ وجلّ) Representatives. Twelve Divinely Appointed Guardians and the last on is the Living Imam of the Time Imam Al-Mahdi(عليه السلام). Others define imam as the 1) Friday Prayer Leader Oneof the main thoughts for Shia is the belief of Ghaybat or occultation of the twelfth Imam, whom is called the Imam of the time/ Imam Zaman. It is believed that he is still alive for now and is over 1,145 years old and he will return with Prophet Jesus to bring peace, equality and justice for the entire world. emphasisof "Tat'hiran". This is the only place in Qur'an that Allah uses the emphasis of. "PERFECT purification". From this Shias deduce that the twelve Imams and family of Prophet. Narrated باسمالله الرحمن الرحيم. Revelation 19: I saw heaven standing open(AG) and there before me was a white horse, whose rider(AH) is called Faithful and True.(AI) With justice he judges and wages white horse, whose rider(AH) is called Faithful and True.(AI) With justice he judges and wages war. Theword Shia in Arabic means a group or supportive party of people. The commonly-known term is shortened from the historical Shia't-Ali , or "the Party of Ali." This group is also known as Shiites or followers of Ahl al-Bayt or "People of the Household" (of the Prophet). Within the Sunni and Shia branches, you can also find a number of sects. ImamMahdi will return at the head of the forces of righteousness and do battle with the forces of evil in one, final, apocalyptic battle. When evil has been defeated once and for all, the Imam Mahdi will rule the world for several years under a perfect government and bring about a perfect spirituality among the peoples of the world. .

what do shias believe about imam mahdi