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. On Galvan Prime, Azmuth scolds Ben, Gwen, and Kevin in his lair for failing to stop him. As Azmuth believes that all hope is lost, Ben says there is still another way to stop Ultimate Aggregor. He says that Kevin made a security system to prevent the transformation into Alien X, so Gwen and Kevin gave Ben their keys and unlocked Alien X, then Ben transformed into Alien X.

Inside Alien X, Ben tries to get the attention of Serena and Bellicus. As they begin arguing over minor things, Professor Paradox suddenly appears, making the two personalities furious and they attempt to destroy Paradox, as he is prohibited to be within 500 light years of them, until Paradox teleports Ben back to Azmuth's lair, transforming Alien X into Ben. As the one who hid it, Paradox can bring the team to the Forge of Creation. After some arguing between each other, Azmuth and Paradox explain that Aggregor's plan was 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 with that power, he 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. The group fly into the Forge of Creation, but something hits the Rustbucket 3 and the group is attacked by Aggrebots and Ben transforms into Terraspin and attacks the soldiers. Terrapin manages to create a tornado that sends them flying out of the Rustbucket and transforms back into Ben. Unfortunately, Kevin's jet hits a wedge in the time barrier and Ben leans against the invisible barrier and falls in. Gwen saves him, but his 10-year-old self emerges.

Young Ben says that Ben looks familiar and asks questions of Ben. recognizes Kevin and still believes him to be evil. He transforms into Heatblast and fights Kevin. Ben tries to transform into Big Chill to stop Young Heatblast, but he transforms into NRG instead. Heatblast attacks NRG, but NRG blasts him, sending him flying away. Gwen saves Heatblast and he reverts back into Young Ben. Young Ben recognizes Gwen as well, but doesn't believe that NRG is him in the future until he transforms back into Ben. Young Ben is still suspicious of Kevin. The team returns to the problem of the Rustbucket's being stuck. Young Ben transforms into Wildmutt and starts eating the ship. Ben exits from the ship and reverts Young Wildmutt back into Young Ben, puzzling him. The ship gets free and they fly through a field of floating Celestialsapiens. They warn young Ben not to get their attention. Young Ben annoys the rest of the team. Kevin yells at him, but he tells him that his joking is his way of coping with the large stakes of his battles. Ben denies that he thinks this way as well. Young Ben looks at Ben's aliens in the Ultimatrix (and calls all of the aliens "lame" except for Humungousaur) as they arrive at a female Celestialsapien holding an infant in her outstretched arms. They crash into her hands.

In the jet, Ben attempts to transform into Big Chill again while Young Ben attempts to transform into Upgrade, but b oth Bens transform into Four Arms and break out of the Rustbucket 3. Ultimate Aggregor arrives and attacks the team. He defeats Gwen and lands. Ultimate Aggregor says that he will kill Ben and take the Celestialsapien. The team fights, but their attacks have no effect. Four Arms transforms young Four Arms into Stinkfly and transforms himself into Swampfire, then transforms himself into Ultimate Swampfire. Stinkfly says that Ultimate Swampfire is a copy of Wildvine. Ultimate Swampfire catches Ultimate Aggregor in vines, but he escapes. He defeats Young Stinkfly and Ultimate Swampfire and Ultimate Swampfire transforms back into Ben and Young Stinkfly reverts back into Young Ben. He approaches the Celestialsapien. Young Ben tells Kevin that he can absorb the Omnitrix to stop Aggregor, but Kevin absorbs the Ultimatrix. Kevin mutates into an amalgam of Ben's aliens and stops Ultimate Aggregor through absorbs his powers, which transforms Ultimate Humungousaur back into normal.

Ben tells Kevin to stop, but Kevin has gone crazy with energy. Young Ben convinces Kevin not to absorb the Celestialsapien and he flies away. Paradox arrives and says that he will return young Ben home. He reveals that young Ben will remember this day as a dream, and it will cause him to trust Kevin. He also tells Ben that he will do what needs to be done. Ben vows to take care of Kevin.

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.
 * Bellicus and Serena make their Ultimate Alien debuts.

Ultimatrix Alien Debuts

 * NRG
 * Alien X
 * Ultimate Kevin

Minor Events

 * The Ultimatrix's lock function is introduced.

Characters

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

Villains

 * Ultimate Aggregor
 * Aggrebots

By 16 year old Ben

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

By 10 year old Ben

 * Heatblast (first re-appearance)
 * Wildmutt
 * Four Arms (selected alien was Upgrade)
 * Stinkfly (first re-appearance)

Trivia

 * According to Dwayne McDuffie, the Celestialsapiens had taken notice of Ben's, his friends and Ultimate Aggregor's presence, and they were debating over what to do.
 * When someone asked if the "next universe over" was our universe, Dwayne replied with "It would've been funny if it was..."
 * Paradox hints that Ben will one day gain control of Alien X.
 * This episode reveals that there are other universes.
 * When Ben and the others enter the Forge of Creations there is a homage to a famous picture taken by the Hubble Telescope, called "Pillars of creation".
 * In the Malay dub of this episode, the scene where young Ben teases Gwen and Kevin's joke about how baby Celestialsapiens are born was deleted for slightly suggestive dialogue.