Spoilers
The issue starts out with Magnetos Freedom Force consisting of Sabra, Jubilee, Frenzy, Rogue and Mister One and Mister Two rescuing Emma from a porcelain prison on Muir Island. She's being guarded by an army of Fantonmex and the prison is basically the same material as his helmet.
As per the previews Magneto needs Emma to perform a psychic rescue for Charles. Xavier was murdered by the Squadran Supreme a year ago when mutants protested for equal rights. In this world the Squadran Supreme are the Avengers from the 00s.
Emma is taken back to Island M and lots of setting the scene goes on. Magneto has been hearing Xaviers voice in his head wants Emma to rescue him. Hyperion and Power Princess attack the island where they are slowed down by Magma and others.
Xaviers reminents are angry at humans and wish to cause humanity harm. There's lots of failsafe and guards that Emma and co bypass. The last hurdle is so well guarded that Emma notes it seems that Xavier wanted this never to get out. Anyway Emma and co are slowly awakened in the real world leaving just Magneto in Xaviers mind.
Rogue, Frenzy and Frost take on the Squadron Supreme and Emma is asked to shut them down before Doctor Spectrum arrives. Emma and Power Princess really don't like each other, Rogue has the powers of Super Skrull
Back to Magneto in the Xavier landscape...It's a trap. That's not Xavier its
spoilers:end of spoilers
Cassandra Nova
She uses reality warping powers to BFR Hyperion and PP