Sayyidna Isa al-Masih, the Lord Jesus Christ, will return from heaven at the appointed time, Nuzul i Isa (the return of Jesus) or Nuzul i Masih (the return of Christ). This appointed time is known only to the Holy Trinity Adorable Unity, the Father and the Son Jesus Christ and the Holy Spirit; not even the elect angels know when it is.
His return will be visible to the whole world. It will be in the in flesh in which He rose from the dead and ascended into heaven with. He will raise all men and judge all men. The world will be cleansed from all sin and evil and the saints and the elect angels will dwell with God the Father and the Son Jesus Christ and the Holy Spirit in this recreated universe for eternity. The damned will be consigned to hell (jahhanam or jahanam) with the devil, Iblis, and the Antichrist, ad Dajjal, and the False Prophet and all of the devils and demons for eternity.
Two prophets of God in the Old Testament (the Tanakh of the Pentateuch of Moses and the books of the prophets) where raised to the Second Heaven by God and miraculously preserved there on a heavenly body. They will return before the Return of Our Lord Jesus Christ and will preach against the Antichrist and be martyred by the Antichrist and then after three and one half days raised by God to heaven. They are Saint Enoch and Saint Elijah. See: Saint Enoch and Saint Elijah in the flesh will return prior to the Parousia of Our Lord Jesus Christ.
See also Nuzul i Isa - Parousia of Jesus Christ.
For the whole history of the world and mission of the two prophets/martyrs, Saint Enoch and Saint Elijah, and the return of The Lord Jesus Christ and the final judgement see the below:
The Apocalypse, the Book of the Revelation
Our Lord and Saviour Jesus Christ
with full Concordance and Commentary
And go to this link (and scroll down to Eucharist) for: Traditional Catholic Prayers: The Eucharist