The Apocalypse is essentially two films. First it's a ground to earth story about corruption in high places and persecution of Christians in the Roman Empire during the days of the Emperor Domitian. Depending on the politics of the day until Constantine became a Christian, persecution waxed and waned in those first 200 or so years. Domitian like some of his predecessors has declared himself a god and doesn't like people around who aren't recognizing his deity. So it's round up the Christians like it was during Nero and slay them, sometimes for sport and amusement.
Sent to the Isle of Patmos where it is rumored that the last of the disciples of Jesus is living the Apostle John, is Benjamin Sadler who both finds John and finds true love with Christian girl Vittoria Belvedere. He also finds a lot of corruption and a great deal about himself.
The aged John is played by Richard Harris and he does it well, one of his better performances in his last years. The second part of the film are the fantasy sequences that become the basis for the Book of Revelation. Do not be watching this film if you are on any kind of pharmaceuticals.
The Apocalypse does have a preachy tone to it which might be off putting to many. Still it's not a bad work and should get more than church viewings.