The Forge of Creation

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

Major Events

 * Alien X is used for the first time since the first season of Alien Force
 * Terraspin is used for the second time.
 * NRG is used for the first time.
 * The group runs into a 10 year old Ben.
 * Aggregor is stopped.
 * Kevin becomes mutated and insane once again.

Characters

 * Ben Tennyson (10 and 16 year olds)
 * Gwen Tennyson
 * Kevin Levin
 * Professor Paradox
 * Azmuth
 * Bellicus
 * Serena
 * Celestialsapiens

Villains

 * Aggregor
 * Kevin Levin (Gone Insane)

16 year old Ben

 * Alien X
 * 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 (selected alien was Upgrade)
 * Stinkfly

Quotes
Ben: (upon seeing his younger self) I really used to be that obnoxious?

Gwen: Used to be?

10 year old Ben;"Your butt is huge."

Gwen;"What did you say?!"

Kevin;"He said your butt is-"

Gwen;"I heard what he said!"

10 year old Ben;"where do baby alien x's come from?"

Kevin;"when 2 constellations love each other very much-"

Gwen;"Kevin!"

Trivia

 * The original Omnitrix has made its reappearance since its destruction in The Final Battle: Part 2 in Alien Force and in the form before its recalibration. In addition, when 10-year-old Ben turns into Heatblast, the scene is accompanied by a reanimation of the original series transformation sequence.
 * Kevin absorbs the Ultimatrix's unlocked aliens' likely because he have very little choice and absorbs Agregors power, but becomes insane again, leaving Ben and Gwen.
 * In the scene where Ben (10 Years Old) looks the Ultimatrix it looks the Omnitrix.
 * It was one of the episodes where Kevin goes through a mutation. The first being Framed and the second being Vengeance of Vilgax.
 * Tara Strong returns to voice 10-year old Ben.
 * Professor Paradox's warning to Ben about leaning against the Chronial Barrier is realized as it causes 10 year old Ben to come to the future.
 * Paradox hints that Ben will one day gain control of Alien X.
 * It's 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".