This takes place in the early 80's, a decade after DAYS OF FUTURE PAST. The opening takes place in Egypt, over 5,000 years ago, during which mutants are trying to transfer the consciousness of "Apocalypse" into a new body (Oscar Isaac). They barely succeed-but not before rebel humans bring down the massive pyramid on top of them. In the present day, Moira McTaggert awakens this being by accident, when she's exploring the ruins. Charles Xavier takes notice of her-and he hasn't seen her in over a decade, ever since he wiped out her memories in him and the mutants in X-MEN: FIRST CLASS.
Poor Magneto can't get a break. He's been laying low in Poland for years and has a wife and young daughter. The daughter's powers are to control animals. But while working at an iron melting plant, an accident happens and Magneto saves the life of a co-worker by levitating some metal. They take notice and soon there's a group of police at his house. They realize he's Magneto and want to take him in. Things get out of hand, as they do, and his wife and daughter are killed. He then kills all the police with a single piece of metal.
Apocalypse is re-aquainting himself with the modern world and does not like what he sees. He thinks everyone should be worshipping him, not "false gods". So he begins to recruit mutants, such as Storm, Angel, Psylocke and Magneto. His talent is to boost their mutant abilities so they become even more powerful. Apocalypse finds out about Charles Xavier and wants to use him as a resource to find all the other mutants-and even boosts the Professor's abilities.
There's also the Xavier School for Gifted Youngsters and we're introduced to a young Scott Summers and Jean Grey (Sophie Turner of GAME OF THRONES). They have a great chemistry. There's also the return of Quicksilver (Evan Peters), who really steals a lot of the scenes, and a very cool Nightcrawler. There's even a scene in which Summers and Jean Grey are introduced to Woverine, which is ingenious.
All in all, I thought this the best X-MEN movie of the six and one of the better superhero movies. Highly recommended.