The X-Men have faced many dangerous and recurring villains in the comics, from Magneto and his rotating Brotherhood of Evil Mutants to lesser foes like Sauron and Mimic, but the biggest thorn in their side, practically during every incarnation of the mutant supergroup, has been the Sentinels, giant mutant hunter-killers programmed with only one directive, to wipe out all mutant existence by any means…
Watch out for the Sparrows.
