Purpose: In this article, we will discuss the narrations and prophecies that exist in Islam, both in Shia, Sunni and other religions regarding Imam Mahdi. This article also attempts to deal with Holy Fatima and her characteristics. Also, we will show that Imam Mahdi is mentioned not only in other religions but also in other books. Also, this research was conducted to answer and clarify three questions that stated in the Introduction section.Methods: We performed our methods in 4 stages: Identifying studies, Selection of Studies, Collating Studies, Reporting results.Results: According to Abrahamic religions, a person will reappear and establish fairness and justice with the help of God, who is called Imam Mahdi and based on the opinion of Christians, he is Christ. If the Shiites, may Allah help them in His obedience, had fulfilled their covenant with united hearts, then there would have been no delay in meeting the Promised Saviour. Conclusion: The concept of Imam Mahdi is universal and cannot just be rejected. The appearance of Imam Mahdi will coincide with the coming back of Jesus Christ. Imam Mahdi, with the assistance of the Messiah, will ensure the completion and practical actualization of the mission of the Prophet Muhammad. The Hidden Imam wrote to Abu-Omar Ameri: The Prophet’s daughter (Holy Fatima) is a nice model for me. We hope this article will take an important step in acquainting people with Imam Mahdi and Jesus Christ and paving the ground for their reappearance.