For three years, Harry Potter has lived in this new world alone, spending his days in Potter's Cottage (name unrelated), just outside Seahaven-Upon-Thames in Essex. On an errand for Death, Harry discovers a threat to the peaceful (if secluded) life he has forged and gets wind of even greater threats to humanity. He will not let Earth be burned down again.
After Harry Potter defeated Voldemort and united the Deathly Hallows, he thought his work was done, but Death had other plans. Becoming the Master of Death was only the first step, and now he had to gather the six Infinity Stones, for Death had showed him what would happen if he did not, and genocide on a Universal Scale wasn't exactly an enticing alternative.
Phil Coulson attempts to recruit Great Britain's richest man, the CEO of Gryffindor-Potter Industries, with mixed results. (Harry Potter X MCU oneshot)
Voldemort...was just the beginning. A terror far worse than he could ever hope to be was awoken during his defeat. NON-CANON for HP. Has obvious MCU deviations.