Retcons

Throughout the Ben 10 franchise, various changes in the continuity, otherwise known as retcons sometimes revisions, have been made. Below are most of the retcons made in the franchise.

Ben 10: Alien Force

 * The Plumbers are now an intergalactic police force, when it was established in the original series that they were comprised of humans only, and several with a racist attitude towards aliens.
 * Gwen's powers are no longer magical in origin, but alien, inherited from her grandmother Verdona. However, elements of magic are retained.
 * All magic is derived from Mana.
 * The Forever Knights now have different factions.
 * The Omnitrix does not actually hold DNA, instead acting as a wireless receiver to Primus.

Ben 10: Ultimate Alien

 * The queen in Ben 10: Alien Swarm has been changed into a decoy.
 * Ben 10: Race Against Time no longer being part of continuity.
 * Eon was changed into an alternate version of Ben.
 * Ben's future has changed and the idea of shifting timelines was introduced allowing revisions in continuity.

Ben 10: Omniverse

 * Feedback was introduced as being a transformation from the original series.
 * The universe and timeline have changed and been revised in the series after Alien X recreated the universe.
 * Ben unlocked Arctiguana when he was 11.
 * Primus was revised out of continuity; instead, DNA is inside the Omnitrix.
 * The origin of the Galvanic Mechamorphs was revised from the original toy info.
 * Ben's last encounter with Vilgax was when he was 11, though it was established in Alien Force that he last met him when he was 10.
 * Max never met Kevin's dad, who didn't even exist - it was all a fake memory made by Servantis.
 * Osmosians are no longer aliens, rather they are humans with unique abilities.
 * The Plumbers' Helpers now have different origins.
 * Some elements of the Ben 10,000 Timeline had been revised.