Minutes after the technical failure of her spacecraft, an astronaut finds herself ejected from her cockpit and into space. She tries in vain to contact to the base to obtain help. Her oxygen level diminishes slowly but surely. Little by little, fear grabs hold of her. She faints... After floating adrift for several hours through the immensity of space, she awakens to find herself facing a strange and mysterious entity, taking the shape of an immense colored cloud.
When the magic powers of The Tablet of Ahkmenrah begin to die out, Larry Daley (Ben Stiller) spans the globe, uniting favorite and new characters while embarking on an epic quest to save the magic before it is gone forever.
The ultimate X-Men ensemble fights a war for the survival of the species across two time periods as they join forces with their younger selves in an epic battle that must change the past – to save our future.