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Aggregor is the main antagonist of the Ben 10: Ultimate Alien what if fanfic The Final Key.
As his canon self he is an Osmosian plotting to absorb the powers of a god-like Celestesapien to ascend to godhood, however unlike his canon counterpart he comes to realize that the risk of going insane in the process is genuine and decides to use Ben as a Buffer to prevent it.
Biography[]
Aggregor first appears in his ship with the captive aliens while using a computer to confirm that his plan would result as expected only to discover that the powers of the aliens would overwhelm him and lose his sanity, thus preventing him from finishing his plan. After thinking a while how to resolve the process he comes to the conclusion that he needs to use other alien whose DNA is compatible with those of the aliens, founding that he could use an human and deciding to go after Ben as his status as a beloved hero would get him access to locations where otherwise it would be difficult to enter for him.
Soon after a seemingly escaped Ra'ad comes to Ben's house at night, awakening him and asking him for help to escape Aggregor and rescue the others, telling Ben to follow him to meet with Galapagus, however when they stop they meet with Aggregor instead revealing that it was a tramp to capture him using a brainwashed Ra'ad, Ben tries to attack Aggregor but he has Ra'ad stop him and reveals he sent the other aliens near Ben's loved ones' homes and will make the brainwashed aliens kill them and their families if Ben doesn't complies to his demands, which are to surrender the Ultimatrix and let him put one of his mind controlling devices and take him to his ship, which Ben complies but warning him that his friends would manage to defeat him.
Once in the ship Aggregor monologues his plans for Ben before starting a test with him and the alien. Later he started his real experiment and forced Ben to absorb the aliens. Soon after he was rounded by several Plumbers who had been seeking for him after Max sent an alert about to all Plumbers in the galaxy to find Aggregor, to which Aggregor answers by making Ben throw a plasma grenade towards them to escape from them, however he still was unable to escape Earth with the Plumbers on his trail so he asks Ben about the biggest power source in Earth of the Plumbers to use it to finish his experiment, and despite Ben's efforts the device forces him to tell him that is La Soledad and immediately he is attacked by Julie transformed into a Bisovortian, a species with magnetic powers, Aggregor tries to use his robots against her but she defeats them, however before she can defeat Aggregor himself she gets distracted trying to save Ben giving him time to attack her with his spear and escape with Ben, while leaving his ship to self-destruct.
Afterwards Aggregor sends Ben to La Soledad, making him ask the soldiers for help so they would take him to the base to receive medical assistance, once Ben was inside the base he attacked it with his army of robots, finally making the Plumbers retreat, however then Julie and her allies arrive before Aggregor had collected enough energy, so he decides to force him to kill them as his last task, turning him into a monstrous hybrid of the aliens similar to Ultimate Aggregor forcing them to fight him, the fight ended after Julie damaged Aggregor's mind control device, resulting in Ben fainting, however soon after Aggregor collected enough energy and managed to take Ben with him and fused with him and the aliens, which resulted in the military dropping a bomb in a desperate last effort to stop Aggregor but thanks to Ben's influence he used his powers to not only save himself but also everybody else in the place. Afterwards Ben tells him that he still can hold him down during his search even if he can't completely stop him altogether and comes to an agreement with him to stay quiet during the trip if he allows him to say goodbye to his friends, after which he escapes Earth to start his quest of the Map of Infinity.
First going to Mykdl'dy, Aggregor reveals to Ben that he his motivation to get god-like powers isn't to rule the universe, but to remake it in his own "greatest design" as he sees it as extremely flawed, then he took Ben's form to pass the guardians of the fragment of the Map.
Once that he got the fragment located on Mykdl'dy, Aggregor continued his quest, managing to get all the pieces as Ben's allies stay behind to save the worlds from destruction that would be caused by the lack of the parts of the Map of Infinity.
In an unspecified time before the final battle at the Forge of Creation Ben finally succumbed to Aggregor. Afterwards Aggregor fights Ben's allies at the Forge of Creation until Kevin decided to absorb the powers of all the Ultimatrix to defeat him which worked as he managed to beat and depower him. It can be assumed that afterwards he was imprisoned by the Plumbers.
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