In our reality, Pietro Maximoff was a member of the Brotherhood of Evil Mutants until they were defeated by the Stranger. Afterwards, both Quicksilver and his sister the Scarlet Witch quit the Brotherhood and joined the Avengers, a world-renowned team of super heroes. Quicksilver would also briefly became a special operative of the United States government in its new version of X-Factor.

005)		Mimic's Reality (Beginnings) Appearances: 1, 14, 51 Akin to our world, Quicksilver was an original member of the Brotherhood.
006)		Blink's Reality (Age of Apocalypse) Appearances: 1 Quicksilver was part of Magneto's X-Men who revolted against Apocalypse.  - For more on the Age of Apocalypse, please visit It Only Hurts When I Sing
020 )		The Skrull Colonies (Open Sesame) Appearances: 10 Quicksilver could be found cracking the key codes to unlock the sealed compartments after the Skrulls fled Earth fearing the coming of Galactus. Though he was able to crack most of them, mostly having 12 digit combinations, he was unable to unlock one door and the Hulk was forced to override it.
036)		Legacy (Tainted Goods) Appearances: 20 Pietro is one of many in the legion of infected Vi-Locks that dominate Earth.
064)		King Hyperion (?) Appearances: 38, 39, 40 One of Magneto's followers in his Brotherhood who retreated onto Asteroid M to sail off into the stars and take another planet as their own. As a parting gift, Magneto released an asteroid that would render Earth a near lifeless dustball within a matter of weeks after impact. After Hyperion and Rogue failed to stop the descending rock before it impacted, Hyperion traveled to Asteroid M to kill the remaining mutants of this world.