The year is 1990: The X-Men all perished more than a decade ago, and Kitty Pryde is no hero. Emma Frost rescued Kitty from an obscure existence as a mere rebellious teen kicked out of boarding school, terrified of ever being discovered as a mutant. After growing up under the tutelage of the White Queen, Kitty is an apex predator of a superior species, yet she lives alone in a tiny, rundown apartment, preferring isolation to a knife in the back. What is her alternative? The world is what it is.

But sometimes Kitty isn’t so sure of that. Sometimes it feels like she phases right out of her own life. Breathe in: She’s suddenly surrounded by friends she’s never known, living out events that never happened. Breathe out: It’s all back to normal. Kitty always shoves these flashes down, until someone from that other life finds her. This familiar stranger, Betsy Braddock, is a rambling confirmation that something is wrong with their world.

Betsy has a wild theory and if it’s right, Kitty’s only shot at changing the present is to free-fall into the past. The girls follow a tenuous psychic trail back to Xavier’s School for Gifted Youngsters in its glory days and embed themselves with the X-Men. There they discover that the inflection point that will unravel their future revolves around a certain omega-level mutant, destined to become the Phoenix. But little do Kitty and Betsy know, they’re not alone in their search.

The year is 1975: Jean Grey has weeks left to live. The Whisperer is coming. He has recruited an ally and accounted for every foreseeable variable. He will leave nothing to chance. He will lead this reality to its Doom.