Second Coming
The Second Coming (sometimes called the Second Advent or the Parousia) is a Christian and Islamic belief regarding the future (or past) return of Jesus Christ after his ascension to heaven about two thousand years ago. The idea is based on messianic prophecies and is part of most Christian eschatologies.
Mahdi
These prophecies according to Ahmadi Muslims have been fulfilled in the person of Mirza Ghulam Ahmad (1835–1908), the founder of the Ahmadiyya Movement, who claimed to be divinely appointed as the second coming of Jesus and the Mahdi in 1891 around the same point in time after Muhammad as Jesus had appeared after Moses (thirteen centuries). Contrary to mainstream Islam, the Ahmadis do not believe that Jesus is alive in heaven, but claim that he survived the crucifixion and migrated towards the east where he died a natural death and that Ghulam Ahmad was only the promised spiritual second coming and likeness of Jesus, the promised Messiah and Mahdi.