The Forge of Creation

The Forge of Creation is the sixteenth episode of Ben 10: Ultimate Alien.

Plot
With Ultimate Aggregor having all four pieces of the Map of Infinity, it looks like his plan will come to fruition. Azmuth scolds Ben, Gwen and Kevin for failing to stop him. As Azmuth believes all hope is lost, Ben says there is still another way to stop Ultimate Aggregor. He says Kevin put in a security system to prevent the transformation of Alien X, so Gwen and Kevin give Ben their keys and unlock Alien X, then Ben transforms into him.

Inside Alien X, Ben tries to get the attention of Serena and Bellicus. As they begin arguing over minor things, Paradox suddenly appears, causing the two personalities furious and attempt to destroy Paradox, as he is prohibited to be within 500 light-years of them, until Paradox is able to turn Ben back to normal and out of Alien X. After some arguing between each other, Azmuth and Paradox explain that Aggregor's plan is to use the Map of Infinity to enter the Forge of Creation, where Celestialsapiens, like Alien X, are born. Ultimate Aggregor is intent on absorbing the powers of a newborn Celestialsapien that has not developed multiple personalities, and can easily conquer the universe. Paradox brings Ben, Gwen and Kevin to the entrance to the Forge of Creation, where he leaves them as he cannot go there. Soon, the group is attacked by Ultimate Aggregor's drones and Terraspin is able to get rid of them. Unfortunately, Kevin's jet hits a wedge in the time barrier and Ben accidentally falls in, only to be saved by Gwen. But Ben just realizes he has brought his ten-year-old self with him.

Young Ben notices Kevin and still believes him to be evil. He transforms into Heatblast and fights Kevin. Ben tries to become Big Chill to stop Young Heatblast, but becomes NRG instead. Soon, they reason with Young Ben, explaining Ben is his older self and that Kevin is no longer evil. Young Ben notices Gwen and instantly insults her like in the original series. With no way to get Young Ben back to his own time, he is forced to join the others. Along the way, Young Ben admits why he was so obnoxious six years ago and looking through the Ultimatrix, seeing how "lame" the aliens except Humungousaur are. They reach the Forge of Creation, filled with giant debating Celestialsapiens, frozen in place. They come across against an even bigger Celestialsapien, holding a baby Celestialsapien in her hands. But then, Kevin's jet crashes and they crash into the mother Celestialsapien's hands.

Both Bens become Four Arms to break free of the jet. Ultimate Aggregor suddenly approaches them and easily defeats them. Four Arms turns Young Four Arms into Young Stinkfly to distract Ultimate Aggregor, while Four Arms becomes Ultimate Swampfire to fight Ultimate Aggregor. But Ultimate Aggregor is still too powerful and still defeats both Bens. Young Ben says that Kevin could absorb the aliens on his Omnitrix, but Kevin says that "He better go with the A-game" and instead chooses to absorb the Ultimatrix, becoming Ultimate Kevin. He prevents Ultimate Aggregor from absorbing the baby Celestialsapien's powers and absorbs his powers, turning Aggregor back to normal.

Ben, Gwen and Young Ben prevent Ultimate Kevin from finishing off Aggregor, but by absorbing the energy of the Ultimatrix aliens, he has become insane once more. He even thinks about absorbing the baby Celestialsapien himself, but Young Ben complains Ultimate Kevin is a jerk and is too busy feeling sorry for himself that he does not notice people try to be nice to him. Ultimate Kevin leaves them, promising to "come back". Paradox appears, telling them he is sending Young Ben back home and will think the whole adventure was a dream. Gwen tells Young Ben to be nice to Gwen and kisses him on the cheek, much to Young Ben's embarrassment. Paradox leaves with Young Ben and now Ben and Gwen's current mission is to return Ultimate Kevin to normal.

Major Events

 * The gang meets up with 10-year-old Ben.
 * Aggregor is stopped by Kevin.
 * Kevin mutates and goes insane once again.
 * NRG makes his debut.
 * Alien X makes his Ultimate Alien debut.

Ultimatrix alien debuts

 * NRG
 * Alien X

Characters

 * Ben Tennyson (10 and 16 year-old)
 * Gwen Tennyson
 * Kevin Levin
 * Professor Paradox
 * Azmuth
 * Bellicus
 * Serena
 * Baby Celestialsapien
 * Mother Celestialsapien
 * Celestialsapiens

Villains

 * Ultimate Aggregor
 * Ultimate Kevin
 * Ultimate Aggregor's Soldiers

16-Year old Ben

 * Alien X (re-appearance)
 * Terraspin
 * NRG (first appearance; selected alien was Big Chill)
 * Four Arms (selected alien was Big Chill)
 * Swampfire
 * Ultimate Swampfire

10-Year old Ben

 * Heatblast
 * Wildmutt
 * Four Arms (accidental transformation; selected alien was Upgrade)
 * Stinkfly

Errors

 * Like in And Then There Were 10 and many other episodes of the original Ben 10 series, 10 year-old Ben's Omnitrix contains an error. The button used to activate the alien selection dial is on the wrong side of the Omnitrix, facing outwards. The button is supposed to face towards Ben for ease-of-access and has mistakenly been put on the outside, or on both sides as seen in And Then There Were 10.
 * In the scene where young Ben looks through the Ultimatrix it looks like the Omnitrix. It's also black and grey.
 * When Ultimate Kevin grabs Ultimate Aggregor's head, before absorbing his powers, his Rath claw is the same color as his left arm and hand, and also changes to Armodrillo's armor color when he shoots Jetray's neuro blasts right in his face before he absorbed his powers.
 * When Ultimate Kevin jumps to fly away from the mother Celestialsapien, his legs are blue along with his pants.
 * When Ben turns from Four Arms to Swampfire for a brief moment, Swampfire's body isn't green but is more of a yellowish brown.
 * In the scene in time barrier, Gwen's collar was red instead of white.
 * Stinkfly was firing blue and green lasers instead of the goo he should have shot.
 * In this episode,the young Ben's shoes are black with white stripes. In the original series, his shoes are white with black stripes.

Trivia

 * When someone asked if the "next universe over" was our universe, Dwayne McDuffie Replied "It would've been funny if it was..."
 * This episode is similar to Ben 10,000:
 * 10-year-old Ben goes into the future and meets his future self but not in 20 years, only 6 years.
 * Young Ben and Ben face off against an enemy they both have a hard time fighting.
 * Young Ben's speeches cause a character to lighten up, in this case it's Kevin.
 * Ben shows younger Ben a method of switching alien forms the same way Ben 10,000 did without the Master Control, although Young Ben doesn't remember how.
 * Young Ben asks how he switched forms and Ben says he'll learn that later.
 * Young Ben asks questions about his future.
 * Younger Ben becomes Stinkfly and older Ben becomes Four Arms.
 * Young Ben has an unintentional transformation, and both times it was with Upgrade and Four Arms, in this episode Ben wanted to go Upgrade but became Four Arms and in Ben 10,000 it was the other way around.
 * Paradox's warnings for both Kevin and Ben come true in this episode.
 * Paradox's warning for Ben not to lean on the Chronal randomization barrier came to fruition, although it should be noted that he knew he wouldn't listen anyway.
 * Paradox's warning for Kevin to remember who his friends are.
 * Kevin goes through a third mutation; the first being in Framed and the second being Vengeance of Vilgax.
 * Tara Strong returns to voice Young Ben.
 * Paradox hints that Ben will one day gain control of Alien X.
 * It is explained that Ben believed his travel into the future was a dream and it was the memory of that dream that led to him trusting Kevin back in Ben 10 Returns and helped saved the universe on more than one occasion.
 * Young Four Arms was voiced by John DiMaggio instead of Richard McGonagle.
 * This episode reveals that there are other universes.
 * Dee Bradley Baker replaces Steve Blum as Young Heatblast, and reprises the Young Stinkfly and Wildmutt, but John DiMaggio voices the Young Four Arms.
 * The Celestialsapiens had taken notice of Ben's presence alongside with his friends and Ultimate Aggregor's said by Dwayne. He said they were debating over what to do.
 * In the Malay dub of this episode, the scene where Ben teases Gwen's buttock and Kevin's joke about how baby Celestialsapien comes to be was deleted for slightly suggestive dialogue.
 * For some reason, in this entire episode, 10-year old Ben's Omnitrix symbol on all of his alien are green and grey, in the original series, (Where he is pulled from) it was white and grey.