UNCANNY X-MEN: DAYS OF FUTURE PRESENT
An adult Franklin Richards travels back from the year 2017 to repair perceived "inaccuracies" in the timeline by altering reality. Richards' tampering of reality triggers a Sentinel program that awakens Ahab, the mutant hound-master, who attempts to apprehend the adult Richards in order to prevent any deviations from the timeline that spurs the Sentinel-ruled North America. Their altercations attract the original X-Factor, Fantastic Four, New Mutants, X-Men, and eventually, an also time-displaced Rachel Summers.
Collects: FANTASTIC FOUR ANNUAL #1, NEW MUTANTS ANNUAL #6, UNCANNY X-MEN ANNUAL #14, and X-FACTOR ANNUAL #5